diff --git a/controllers/class.AddDocument.php b/controllers/class.AddDocument.php
index bf6e9fb69..7f2a73cbe 100644
--- a/controllers/class.AddDocument.php
+++ b/controllers/class.AddDocument.php
@@ -55,13 +55,40 @@ class SeedDMS_Controller_AddDocument extends SeedDMS_Controller_Common {
 		$reqversion = $this->getParam('reqversion');
 		$version_comment = $this->getParam('versioncomment');
 		$attributes = $this->getParam('attributes');
-		foreach($attributes as $attrdefid=>$attribute) {
+		foreach($attributes as $attrdefid=>&$attribute) {
 			if($attrdef = $dms->getAttributeDefinition($attrdefid)) {
 				if(null === ($ret = $this->callHook('validateAttribute', $attrdef, $attribute))) {
 				if($attribute) {
 					switch($attrdef->getType()) {
 					case SeedDMS_Core_AttributeDefinition::type_date:
-						$attribute = date('Y-m-d', makeTsFromDate($attribute));
+						if(is_array($attribute))
+							$attribute = array_map(fn($value): string => date('Y-m-d', makeTsFromDate($value)), $attribute);
+						else
+							$attribute = date('Y-m-d', makeTsFromDate($attribute));
+						break;
+					case SeedDMS_Core_AttributeDefinition::type_folder:
+						if(is_array($attribute))
+							$attribute = array_map(fn($value): object => $dms->getFolder((int) $value), $attribute);
+						else
+							$attribute = $dms->getFolder((int) $attribute);
+						break;
+					case SeedDMS_Core_AttributeDefinition::type_document:
+						if(is_array($attribute))
+							$attribute = array_map(fn($value): object => $dms->getDocument((int) $value), $attribute);
+						else
+							$attribute = $dms->getDocument((int) $attribute);
+						break;
+					case SeedDMS_Core_AttributeDefinition::type_user:
+						if(is_array($attribute))
+							$attribute = array_map(fn($value): object => $dms->getUser((int) $value), $attribute);
+						else
+							$attribute = $dms->getUser((int) $attribute);
+						break;
+					case SeedDMS_Core_AttributeDefinition::type_group:
+						if(is_array($attribute))
+							$attribute = array_map(fn($value): object => $dms->getGroup((int) $value), $attribute);
+						else
+							$attribute = $dms->getGroup((int) $attribute);
 						break;
 					}
 					if(!$attrdef->validate($attribute, null, true)) {
@@ -79,13 +106,40 @@ class SeedDMS_Controller_AddDocument extends SeedDMS_Controller_Common {
 			}
 		}
 		if($attributes_version = $this->getParam('attributesversion')) {
-			foreach($attributes_version as $attrdefid=>$attribute) {
+			foreach($attributes_version as $attrdefid=>&$attribute) {
 				if($attrdef = $dms->getAttributeDefinition($attrdefid)) {
 					if(null === ($ret = $this->callHook('validateAttribute', $attrdef, $attribute))) {
 					if($attribute) {
 						switch($attrdef->getType()) {
 						case SeedDMS_Core_AttributeDefinition::type_date:
-							$attribute = date('Y-m-d', makeTsFromDate($attribute));
+							if(is_array($attribute))
+								$attribute = array_map(fn($value): string => date('Y-m-d', makeTsFromDate($value)), $attribute);
+							else
+								$attribute = date('Y-m-d', makeTsFromDate($attribute));
+							break;
+						case SeedDMS_Core_AttributeDefinition::type_folder:
+							if(is_array($attribute))
+								$attribute = array_map(fn($value): object => $dms->getFolder((int) $value), $attribute);
+							else
+								$attribute = $dms->getFolder((int) $attribute);
+							break;
+						case SeedDMS_Core_AttributeDefinition::type_document:
+							if(is_array($attribute))
+								$attribute = array_map(fn($value): object => $dms->getDocument((int) $value), $attribute);
+							else
+								$attribute = $dms->getDocument((int) $attribute);
+							break;
+						case SeedDMS_Core_AttributeDefinition::type_user:
+							if(is_array($attribute))
+								$attribute = array_map(fn($value): object => $dms->getUser((int) $value), $attribute);
+							else
+								$attribute = $dms->getUser((int) $attribute);
+							break;
+						case SeedDMS_Core_AttributeDefinition::type_group:
+							if(is_array($attribute))
+								$attribute = array_map(fn($value): object => $dms->getGroup((int) $value), $attribute);
+							else
+								$attribute = $dms->getGroup((int) $attribute);
 							break;
 						}
 						if(!$attrdef->validate($attribute, null, true)) {
diff --git a/controllers/class.AddSubFolder.php b/controllers/class.AddSubFolder.php
index 24a609cb8..10e99d00c 100644
--- a/controllers/class.AddSubFolder.php
+++ b/controllers/class.AddSubFolder.php
@@ -41,13 +41,40 @@ class SeedDMS_Controller_AddSubFolder extends SeedDMS_Controller_Common {
 		$comment = $this->getParam('comment');
 		$sequence = $this->getParam('sequence');
 		$attributes = $this->getParam('attributes');
-		foreach($attributes as $attrdefid=>$attribute) {
+		foreach($attributes as $attrdefid=>&$attribute) {
 			if($attrdef = $dms->getAttributeDefinition($attrdefid)) {
 				if(null === ($ret = $this->callHook('validateAttribute', $attrdef, $attribute))) {
 				if($attribute) {
 					switch($attrdef->getType()) {
 					case SeedDMS_Core_AttributeDefinition::type_date:
-						$attribute = date('Y-m-d', makeTsFromDate($attribute));
+						if(is_array($attribute))
+							$attribute = array_map(fn($value): string => date('Y-m-d', makeTsFromDate($value)), $attribute);
+						else
+							$attribute = date('Y-m-d', makeTsFromDate($attribute));
+						break;
+					case SeedDMS_Core_AttributeDefinition::type_folder:
+						if(is_array($attribute))
+							$attribute = array_map(fn($value): object => $dms->getFolder((int) $value), $attribute);
+						else
+							$attribute = $dms->getFolder((int) $attribute);
+						break;
+					case SeedDMS_Core_AttributeDefinition::type_document:
+						if(is_array($attribute))
+							$attribute = array_map(fn($value): object => $dms->getDocument((int) $value), $attribute);
+						else
+							$attribute = $dms->getDocument((int) $attribute);
+						break;
+					case SeedDMS_Core_AttributeDefinition::type_user:
+						if(is_array($attribute))
+							$attribute = array_map(fn($value): object => $dms->getUser((int) $value), $attribute);
+						else
+							$attribute = $dms->getUser((int) $attribute);
+						break;
+					case SeedDMS_Core_AttributeDefinition::type_group:
+						if(is_array($attribute))
+							$attribute = array_map(fn($value): object => $dms->getGroup((int) $value), $attribute);
+						else
+							$attribute = $dms->getGroup((int) $attribute);
 						break;
 					}
 					if(!$attrdef->validate($attribute, null, true)) {
diff --git a/controllers/class.EditDocument.php b/controllers/class.EditDocument.php
index bfe0dac30..cd86dfedf 100644
--- a/controllers/class.EditDocument.php
+++ b/controllers/class.EditDocument.php
@@ -122,7 +122,34 @@ class SeedDMS_Controller_EditDocument extends SeedDMS_Controller_Common {
 						if($attribute) {
 							switch($attrdef->getType()) {
 							case SeedDMS_Core_AttributeDefinition::type_date:
-								$attribute = date('Y-m-d', makeTsFromDate($attribute));
+								if(is_array($attribute))
+									$attribute = array_map(fn($value): string => date('Y-m-d', makeTsFromDate($value)), $attribute);
+								else
+									$attribute = date('Y-m-d', makeTsFromDate($attribute));
+								break;
+							case SeedDMS_Core_AttributeDefinition::type_folder:
+								if(is_array($attribute))
+									$attribute = array_map(fn($value): object => $dms->getFolder((int) $value), $attribute);
+								else
+									$attribute = $dms->getFolder((int) $attribute);
+								break;
+							case SeedDMS_Core_AttributeDefinition::type_document:
+								if(is_array($attribute))
+									$attribute = array_map(fn($value): object => $dms->getDocument((int) $value), $attribute);
+								else
+									$attribute = $dms->getDocument((int) $attribute);
+								break;
+							case SeedDMS_Core_AttributeDefinition::type_user:
+								if(is_array($attribute))
+									$attribute = array_map(fn($value): object => $dms->getUser((int) $value), $attribute);
+								else
+									$attribute = $dms->getUser((int) $attribute);
+								break;
+							case SeedDMS_Core_AttributeDefinition::type_group:
+								if(is_array($attribute))
+									$attribute = array_map(fn($value): object => $dms->getGroup((int) $value), $attribute);
+								else
+									$attribute = $dms->getGroup((int) $attribute);
 								break;
 							}
 							if(!$attrdef->validate($attribute, $document, false)) {
diff --git a/controllers/class.EditFolder.php b/controllers/class.EditFolder.php
index 94a1fa066..2df566189 100644
--- a/controllers/class.EditFolder.php
+++ b/controllers/class.EditFolder.php
@@ -51,33 +51,61 @@ class SeedDMS_Controller_EditFolder extends SeedDMS_Controller_Common {
 			$oldattributes = $folder->getAttributes();
 			if($attributes) {
 				foreach($attributes as $attrdefid=>$attribute) {
-					$attrdef = $dms->getAttributeDefinition($attrdefid);
-					if(null === ($ret = $this->callHook('validateAttribute', $attrdef, $attribute))) {
-					if($attribute) {
-						switch($attrdef->getType()) {
-						case SeedDMS_Core_AttributeDefinition::type_date:
-							$attribute = date('Y-m-d', makeTsFromDate($attribute));
-							break;
-						}
-						if(!$attrdef->validate($attribute, $folder, false)) {
-							$this->errormsg	= getAttributeValidationText($attrdef->getValidationError(), $attrdef->getName(), $attribute);
-							return false;
-						}
+					if($attrdef = $dms->getAttributeDefinition($attrdefid)) {
+						if(null === ($ret = $this->callHook('validateAttribute', $attrdef, $attribute))) {
+						if($attribute) {
+							switch($attrdef->getType()) {
+							case SeedDMS_Core_AttributeDefinition::type_date:
+								if(is_array($attribute))
+									$attribute = array_map(fn($value): string => date('Y-m-d', makeTsFromDate($value)), $attribute);
+								else
+									$attribute = date('Y-m-d', makeTsFromDate($attribute));
+								break;
+							case SeedDMS_Core_AttributeDefinition::type_folder:
+								if(is_array($attribute))
+									$attribute = array_map(fn($value): object => $dms->getFolder((int) $value), $attribute);
+								else
+									$attribute = $dms->getFolder((int) $attribute);
+								break;
+							case SeedDMS_Core_AttributeDefinition::type_document:
+								if(is_array($attribute))
+									$attribute = array_map(fn($value): object => $dms->getDocument((int) $value), $attribute);
+								else
+									$attribute = $dms->getDocument((int) $attribute);
+								break;
+							case SeedDMS_Core_AttributeDefinition::type_user:
+								if(is_array($attribute))
+									$attribute = array_map(fn($value): object => $dms->getUser((int) $value), $attribute);
+								else
+									$attribute = $dms->getUser((int) $attribute);
+								break;
+							case SeedDMS_Core_AttributeDefinition::type_group:
+								if(is_array($attribute))
+									$attribute = array_map(fn($value): object => $dms->getGroup((int) $value), $attribute);
+								else
+									$attribute = $dms->getGroup((int) $attribute);
+								break;
+							}
+							if(!$attrdef->validate($attribute, $folder, false)) {
+								$this->errormsg	= getAttributeValidationText($attrdef->getValidationError(), $attrdef->getName(), $attribute);
+								return false;
+							}
 
-						if(!isset($oldattributes[$attrdefid]) || $attribute != $oldattributes[$attrdefid]->getValue()) {
-							if(!$folder->setAttributeValue($dms->getAttributeDefinition($attrdefid), $attribute))
+							if(!isset($oldattributes[$attrdefid]) || $attribute != $oldattributes[$attrdefid]->getValue()) {
+								if(!$folder->setAttributeValue($dms->getAttributeDefinition($attrdefid), $attribute))
+									return false;
+							}
+						} elseif($attrdef->getMinValues() > 0) {
+							$this->errormsg = getMLText("attr_min_values", array("attrname"=>$attrdef->getName()));
+								return false;
+						} elseif(isset($oldattributes[$attrdefid])) {
+							if(!$folder->removeAttribute($dms->getAttributeDefinition($attrdefid)))
+								return false;
+						}
+						} else {
+							if($ret === false)
 								return false;
 						}
-					} elseif($attrdef->getMinValues() > 0) {
-						$this->errormsg = getMLText("attr_min_values", array("attrname"=>$attrdef->getName()));
-							return false;
-					} elseif(isset($oldattributes[$attrdefid])) {
-						if(!$folder->removeAttribute($dms->getAttributeDefinition($attrdefid)))
-							return false;
-					}
-					} else {
-						if($ret === false)
-							return false;
 					}
 				}
 			}
diff --git a/op/op.EditAttributes.php b/op/op.EditAttributes.php
index 8e4d3c01e..7476c68d8 100644
--- a/op/op.EditAttributes.php
+++ b/op/op.EditAttributes.php
@@ -70,27 +70,55 @@ foreach($version->getAttributes() as $ai=>$aa)
 $attributes = $_POST["attributes"];
 if($attributes) {
 	foreach($attributes as $attrdefid=>$attribute) {
-		$attrdef = $dms->getAttributeDefinition($attrdefid);
-		if($attribute) {
-			switch($attrdef->getType()) {
-			case SeedDMS_Core_AttributeDefinition::type_date:
-				$attribute = date('Y-m-d', makeTsFromDate($attribute));
-				break;
-			}
-			if(!$attrdef->validate($attribute, $version, false)) {
-				$errmsg = getAttributeValidationText($attrdef->getValidationError(), $attrdef->getName(), $attribute);
-				UI::exitError(getMLText("document_title", array("documentname" => $document->getName())), $errmsg);
-			}
-			if(!isset($oldattributes[$attrdefid]) || $attribute != $oldattributes[$attrdefid]->getValue()) {
-				if(!$version->setAttributeValue($dms->getAttributeDefinition($attrdefid), $attribute)) {
-					UI::exitError(getMLText("document_title", array("documentname" => $document->getName())),getMLText("error_occured"));
+		if($attrdef = $dms->getAttributeDefinition($attrdefid)) {
+			if($attribute) {
+				switch($attrdef->getType()) {
+				case SeedDMS_Core_AttributeDefinition::type_date:
+					if(is_array($attribute))
+						$attribute = array_map(fn($value): string => date('Y-m-d', makeTsFromDate($value)), $attribute);
+					else
+						$attribute = date('Y-m-d', makeTsFromDate($attribute));
+					break;
+				case SeedDMS_Core_AttributeDefinition::type_folder:
+					if(is_array($attribute))
+						$attribute = array_map(fn($value): object => $dms->getFolder((int) $value), $attribute);
+					else
+						$attribute = $dms->getFolder((int) $attribute);
+					break;
+				case SeedDMS_Core_AttributeDefinition::type_document:
+					if(is_array($attribute))
+						$attribute = array_map(fn($value): object => $dms->getDocument((int) $value), $attribute);
+					else
+						$attribute = $dms->getDocument((int) $attribute);
+					break;
+				case SeedDMS_Core_AttributeDefinition::type_user:
+					if(is_array($attribute))
+						$attribute = array_map(fn($value): object => $dms->getUser((int) $value), $attribute);
+					else
+						$attribute = $dms->getUser((int) $attribute);
+					break;
+				case SeedDMS_Core_AttributeDefinition::type_group:
+					if(is_array($attribute))
+						$attribute = array_map(fn($value): object => $dms->getGroup((int) $value), $attribute);
+					else
+						$attribute = $dms->getGroup((int) $attribute);
+					break;
 				}
+				if(!$attrdef->validate($attribute, $version, false)) {
+					$errmsg = getAttributeValidationText($attrdef->getValidationError(), $attrdef->getName(), $attribute);
+					UI::exitError(getMLText("document_title", array("documentname" => $document->getName())), $errmsg);
+				}
+				if(!isset($oldattributes[$attrdefid]) || $attribute != $oldattributes[$attrdefid]->getValue()) {
+					if(!$version->setAttributeValue($dms->getAttributeDefinition($attrdefid), $attribute)) {
+						UI::exitError(getMLText("document_title", array("documentname" => $document->getName())),getMLText("error_occured"));
+					}
+				}
+			} elseif($attrdef->getMinValues() > 0) {
+				UI::exitError(getMLText("document_title", array("documentname" => $document->getName())),getMLText("attr_min_values", array("attrname"=>$attrdef->getName())));
+			} elseif(isset($oldattributes[$attrdefid])) {
+				if(!$version->removeAttribute($dms->getAttributeDefinition($attrdefid)))
+					UI::exitError(getMLText("document_title", array("documentname" => $folder->getName())),getMLText("error_occured"));
 			}
-		} elseif($attrdef->getMinValues() > 0) {
-			UI::exitError(getMLText("document_title", array("documentname" => $document->getName())),getMLText("attr_min_values", array("attrname"=>$attrdef->getName())));
-		} elseif(isset($oldattributes[$attrdefid])) {
-			if(!$version->removeAttribute($dms->getAttributeDefinition($attrdefid)))
-				UI::exitError(getMLText("document_title", array("documentname" => $folder->getName())),getMLText("error_occured"));
 		}
 	}
 }
diff --git a/views/bootstrap/class.AttributeMgr.php b/views/bootstrap/class.AttributeMgr.php
index 1fe5fddb7..5e16006ab 100644
--- a/views/bootstrap/class.AttributeMgr.php
+++ b/views/bootstrap/class.AttributeMgr.php
@@ -93,14 +93,26 @@ $(document).ready( function() {
 						$content .= "</tr></thead>\n<tbody>\n";
 						$separator = $selattrdef->getValueSetSeparator();
 						foreach($res['frequencies'][$type] as $entry) {
-							$value = $selattrdef->parseValue($entry['value']);
+							if(is_array($entry['value'])) {
+								$values = $entry['value'];
+							} else {
+								$values = [$entry['value']];
+							}
+							$value = [];
+							foreach($values as $v) {
+								if(is_object($v))
+									$value[] = $v->getId();
+								else
+									$value[] = $v;
+							}
+//							$value = $selattrdef->parseValue($entry['value']);
 							$content .= "<tr>";
 							$content .= "<td>".htmlspecialchars(implode('<span style="color: #aaa;">'.($separator ? ' '.$separator.' ' : ' ; ').'</span>', $value))."</td>";
 							$content .= "<td><a href=\"../out/out.Search.php?fullsearch=0&resultmode=".($type == 'folder' ? 2 : ($type == 'document' ? 1 : 3))."&";
 							if($selattrdef->getType() == SeedDMS_Core_AttributeDefinition::type_date)
 								$content .= "attributes[".$selattrdef->getID()."][from]=".urlencode($entry['value'])."&attributes[".$selattrdef->getID()."][to]=".urlencode($entry['value']);
 							else
-								$content .= "attributes[".$selattrdef->getID()."]=".urlencode($entry['value']);
+								$content .= "attributes[".$selattrdef->getID()."]=".urlencode($value[0]);
 							$content .= "\">".urlencode($entry['c'])."</a></td>";
 							$content .= "<td>";
 							/* various checks, if the value is valid */
diff --git a/views/bootstrap/class.Bootstrap.php b/views/bootstrap/class.Bootstrap.php
index 18ff23438..b228624e6 100644
--- a/views/bootstrap/class.Bootstrap.php
+++ b/views/bootstrap/class.Bootstrap.php
@@ -1879,26 +1879,23 @@ $(document).ready(function() {
 		case SeedDMS_Core_AttributeDefinition::type_folder:
 			$attrs = $attribute->getValueAsArray();
 			$tmp = array();
-			foreach($attrs as $attr) {
-				if($targetfolder = $dms->getFolder(intval($attr)))
-					$tmp[] = '<a href="'.$this->params['settings']->_httpRoot.'out/out.ViewFolder.php?folderid='.$targetfolder->getId().'">'.htmlspecialchars($targetfolder->getName()).'</a>';
+			foreach($attrs as $targetfolder) {
+				$tmp[] = '<a href="'.$this->params['settings']->_httpRoot.'out/out.ViewFolder.php?folderid='.$targetfolder->getId().'">'.htmlspecialchars($targetfolder->getName()).'</a>';
 			}
 			return implode('<br />', $tmp);
 			break;
 		case SeedDMS_Core_AttributeDefinition::type_document:
 			$attrs = $attribute->getValueAsArray();
 			$tmp = array();
-			foreach($attrs as $attr) {
-				if($targetdoc = $dms->getDocument(intval($attr)))
-					$tmp[] = '<a href="'.$this->params['settings']->_httpRoot.'out/out.ViewDocument.php?documentid='.$targetdoc->getId().'">'.htmlspecialchars($targetdoc->getName()).'</a>';
+			foreach($attrs as $targetdoc) {
+				$tmp[] = '<a href="'.$this->params['settings']->_httpRoot.'out/out.ViewDocument.php?documentid='.$targetdoc->getId().'">'.htmlspecialchars($targetdoc->getName()).'</a>';
 			}
 			return implode('<br />', $tmp);
 			break;
 		case SeedDMS_Core_AttributeDefinition::type_user:
 			$attrs = $attribute->getValueAsArray();
 			$tmp = array();
-			foreach($attrs as $attr) {
-				$curuser = $dms->getUser((int) $attr);
+			foreach($attrs as $curuser) {
 				$tmp[] = htmlspecialchars($curuser->getFullname()." (".$curuser->getLogin().")");
 			}
 			return implode('<br />', $tmp);
@@ -1906,8 +1903,7 @@ $(document).ready(function() {
 		case SeedDMS_Core_AttributeDefinition::type_group:
 			$attrs = $attribute->getValueAsArray();
 			$tmp = array();
-			foreach($attrs as $attr) {
-				$curgroup = $dms->getGroup((int) $attr);
+			foreach($attrs as $curgroup) {
 				$tmp[] = htmlspecialchars($curgroup->getName());
 			}
 			return implode('<br />', $tmp);
@@ -1957,23 +1953,18 @@ $(document).ready(function() {
 			$content .= "<input type=\"text\" id=\"".$attr_id."\" name=\"".$attr_name."\" value=\"".htmlspecialchars($objvalue)."\"".((!$norequire && $attrdef->getMinValues() > 0) ? ' required="required"' : '')." data-rule-number=\"true\"/>";
 			break; */
 		case SeedDMS_Core_AttributeDefinition::type_folder:
-			$objvalue = $attribute ? (is_object($attribute) ? (int) $attribute->getValue() : (int) $attribute) : 0;
-			if($objvalue)
-				$target = $dms->getFolder($objvalue);
-			else
-				$target = null;
+			$target = $attribute ? $attribute->getValue() : null;
 			$content .= $this->getFolderChooserHtml("attr".$attrdef->getId(), M_READWRITE, -1, $target, $attr_name, false);
 			break;
 		case SeedDMS_Core_AttributeDefinition::type_document:
-			$objvalue = $attribute ? (is_object($attribute) ? (int) $attribute->getValue() : (int) $attribute) : 0;
-			if($objvalue)
-				$target = $dms->getDocument($objvalue);
-			else
-				$target = null;
+			$target = $attribute ? $attribute->getValue() : null;
 			$content .= $this->getDocumentChooserHtml("attr".$attrdef->getId(), $target, $attr_name);
 			break;
 		case SeedDMS_Core_AttributeDefinition::type_user:
-			$objvalue = $attribute ? (is_object($attribute) ? $attribute->getValueAsArray() : (is_string($attribute) ? [$attribute] : $attribute)) : array();
+			$target = $attribute ? $attribute->getValueAsArray() : [];
+			$objvalue = [];
+			foreach($target as $t)
+				$objvalue[] = $t->getId();
 			$users = $dms->getAllUsers();
 			if($users) {
 				$allowempty = $attrdef->getMinValues() == 0;
@@ -1993,7 +1984,10 @@ $(document).ready(function() {
 			}
 			break;
 		case SeedDMS_Core_AttributeDefinition::type_group:
-			$objvalue = $attribute ? (is_object($attribute) ? $attribute->getValueAsArray() : (is_string($attribute) ? [$attribute] : $attribute)) : array();
+			$target = $attribute ? $attribute->getValueAsArray() : [];
+			$objvalue = [];
+			foreach($target as $t)
+				$objvalue[] = $t->getId();
 			$groups = $dms->getAllGroups();
 			if($groups) {
 				$allowempty = $attrdef->getMinValues() == 0;
diff --git a/views/bootstrap/class.Search.php b/views/bootstrap/class.Search.php
index 7bca0863d..c22b4bbc2 100644
--- a/views/bootstrap/class.Search.php
+++ b/views/bootstrap/class.Search.php
@@ -1498,7 +1498,7 @@ $(document).ready(function() {
 								$attrstr .= $arr;
 							} else {
 								$attrdef = $docattribute->getAttributeDefinition();
-								$attrstr .= "<tr><td>".htmlspecialchars($attrdef->getName())."</td><td>".htmlspecialchars(implode(', ', $docattribute->getValueAsArray()))."</td></tr>\n";
+								$attrstr .= "<tr><td>".htmlspecialchars($attrdef->getName())."</td><td>".htmlspecialchars($docattribute->getValueAsString())."</td></tr>\n";
 							}
 						}
 						$attrstr .= "</table>\n";
diff --git a/views/bootstrap4/class.Bootstrap4.php b/views/bootstrap4/class.Bootstrap4.php
index 65351411b..81f140366 100644
--- a/views/bootstrap4/class.Bootstrap4.php
+++ b/views/bootstrap4/class.Bootstrap4.php
@@ -1917,26 +1917,23 @@ $(document).ready(function() {
 		case SeedDMS_Core_AttributeDefinition::type_folder:
 			$attrs = $attribute->getValueAsArray();
 			$tmp = array();
-			foreach($attrs as $attr) {
-				if($targetfolder = $dms->getFolder(intval($attr)))
-					$tmp[] = '<a href="'.$this->params['settings']->_httpRoot.'out/out.ViewFolder.php?folderid='.$targetfolder->getId().'">'.htmlspecialchars($targetfolder->getName()).'</a>';
+			foreach($attrs as $targetfolder) {
+				$tmp[] = '<a href="'.$this->params['settings']->_httpRoot.'out/out.ViewFolder.php?folderid='.$targetfolder->getId().'">'.htmlspecialchars($targetfolder->getName()).'</a>';
 			}
 			return implode('<br />', $tmp);
 			break;
 		case SeedDMS_Core_AttributeDefinition::type_document:
 			$attrs = $attribute->getValueAsArray();
 			$tmp = array();
-			foreach($attrs as $attr) {
-				if($targetdoc = $dms->getDocument(intval($attr)))
-					$tmp[] = '<a href="'.$this->params['settings']->_httpRoot.'out/out.ViewDocument.php?documentid='.$targetdoc->getId().'">'.htmlspecialchars($targetdoc->getName()).'</a>';
+			foreach($attrs as $targetdoc) {
+				$tmp[] = '<a href="'.$this->params['settings']->_httpRoot.'out/out.ViewDocument.php?documentid='.$targetdoc->getId().'">'.htmlspecialchars($targetdoc->getName()).'</a>';
 			}
 			return implode('<br />', $tmp);
 			break;
 		case SeedDMS_Core_AttributeDefinition::type_user:
 			$attrs = $attribute->getValueAsArray();
 			$tmp = array();
-			foreach($attrs as $attr) {
-				$curuser = $dms->getUser((int) $attr);
+			foreach($attrs as $curuser) {
 				$tmp[] = htmlspecialchars($curuser->getFullname()." (".$curuser->getLogin().")");
 			}
 			return implode('<br />', $tmp);
@@ -1944,8 +1941,7 @@ $(document).ready(function() {
 		case SeedDMS_Core_AttributeDefinition::type_group:
 			$attrs = $attribute->getValueAsArray();
 			$tmp = array();
-			foreach($attrs as $attr) {
-				$curgroup = $dms->getGroup((int) $attr);
+			foreach($attrs as $curgroup) {
 				$tmp[] = htmlspecialchars($curgroup->getName());
 			}
 			return implode('<br />', $tmp);
@@ -1979,17 +1975,11 @@ $(document).ready(function() {
 			$content .= "<input type=\"checkbox\" id=\"".$attr_id."\" name=\"".$attr_name."\" value=\"1\" ".($objvalue ? 'checked' : '')." />";
 			break;
 		case SeedDMS_Core_AttributeDefinition::type_date:
-			$objvalue = $attribute ? (is_object($attribute) ? $attribute->getValue() : $attribute) : '';
+			$objvalue = $attribute ? getReadableDate((is_object($attribute) ? $attribute->getValue() : $attribute)) : '';
 			$dateformat = getConvertDateFormat($this->params['settings']->_dateformat);
-			/*
-				$content .= '<span class="input-append date datepicker" data-date="'.getReadableDate(').'" data-date-format="'.$dateformat.'" data-date-language="'.str_replace('_', '-', $this->params['session']->getLanguage()).'">
-					<input id="'.$attr_id.'" class="span9" size="16" name="'.$attr_name.'" type="text" value="'.($objvalue ? $objvalue : '').'">
-          <span class="add-on"><i class="fa fa-calendar"></i></span>
-					</span>';
-			*/
 			$content = '
 <div class="input-group date">
-	<input type="text" class="form-control" id="'.$attr_id.'" name="'.$attr_name.'" value="'.($objvalue ? getReadableDate($objvalue) : '').'" data-date="'.getReadableDate().'" data-date-format="'.$dateformat.'" data-date-language="'.str_replace('_', '-', $this->params['session']->getLanguage()).'" data-date-autoclose="true" data-provide="datepicker">
+	<input type="text" class="form-control" id="'.$attr_id.'" name="'.$attr_name.'" value="'.($objvalue ? $objvalue : '').'" data-date="'.getReadableDate().'" data-date-format="'.$dateformat.'" data-date-language="'.str_replace('_', '-', $this->params['session']->getLanguage()).'" data-date-autoclose="true" data-provide="datepicker">
 	<div class="input-group-append">
 		<span class="input-group-text"><i class="fa fa-calendar"></i></span>
 	</div>
@@ -2005,23 +1995,18 @@ $(document).ready(function() {
 			$content .= "<input type=\"text\" class=\"form-control\" id=\"".$attr_id."\" name=\"".$attr_name."\" value=\"".htmlspecialchars($objvalue)."\"".((!$norequire && $attrdef->getMinValues() > 0) ? ' required="required"' : '')." data-rule-number=\"true\"/>";
 			break; */
 		case SeedDMS_Core_AttributeDefinition::type_folder:
-			$objvalue = $attribute ? (is_object($attribute) ? (int) $attribute->getValue() : (int) $attribute) : 0;
-			if($objvalue)
-				$target = $dms->getFolder($objvalue);
-			else
-				$target = null;
+			$target = $attribute ? $attribute->getValue() : null;
 			$content .= $this->getFolderChooserHtml("attr".$attrdef->getId(), M_READWRITE, -1, $target, $attr_name, false);
 			break;
 		case SeedDMS_Core_AttributeDefinition::type_document:
-			$objvalue = $attribute ? (is_object($attribute) ? (int) $attribute->getValue() : (int) $attribute) : 0;
-			if($objvalue)
-				$target = $dms->getDocument($objvalue);
-			else
-				$target = null;
+			$target = $attribute ? $attribute->getValue() : null;
 			$content .= $this->getDocumentChooserHtml("attr".$attrdef->getId(), $target, $attr_name);
 			break;
 		case SeedDMS_Core_AttributeDefinition::type_user:
-			$objvalue = $attribute ? (is_object($attribute) ? $attribute->getValueAsArray() : (is_string($attribute) ? [$attribute] : $attribute)) : array();
+			$target = $attribute ? $attribute->getValueAsArray() : [];
+			$objvalue = [];
+			foreach($target as $t)
+				$objvalue[] = $t->getId();
 			$users = $dms->getAllUsers();
 			if($users) {
 				$allowempty = $attrdef->getMinValues() == 0;
@@ -2041,7 +2026,10 @@ $(document).ready(function() {
 			}
 			break;
 		case SeedDMS_Core_AttributeDefinition::type_group:
-			$objvalue = $attribute ? (is_object($attribute) ? $attribute->getValueAsArray() : (is_string($attribute) ? [$attribute] : $attribute)) : array();
+			$target = $attribute ? $attribute->getValueAsArray() : [];
+			$objvalue = [];
+			foreach($target as $t)
+				$objvalue[] = $t->getId();
 			$groups = $dms->getAllGroups();
 			if($groups) {
 				$allowempty = $attrdef->getMinValues() == 0;