diff --git a/SeedDMS_Core/Core/inc.ClassDMS.php b/SeedDMS_Core/Core/inc.ClassDMS.php
index ce53de34c..0b50c1609 100644
--- a/SeedDMS_Core/Core/inc.ClassDMS.php
+++ b/SeedDMS_Core/Core/inc.ClassDMS.php
@@ -2062,6 +2062,34 @@ class SeedDMS_Core_DMS {
 		
 	} /* }}} */
 
+	/**
+	 * Returns document content which is duplicated
+	 *
+	 * This method is for finding document content which is available twice
+	 * in the database. The checksum of a document content was introduced
+	 * in version 4.0.0 of SeedDMS for finding duplicates.
+	 */
+	function getDuplicateDocumentContent() { /* {{{ */
+		$queryStr = "SELECT a.*, b.id as dupid FROM tblDocumentContent a LEFT JOIN tblDocumentContent b ON a.checksum=b.checksum where a.id!=b.id ORDER by a.id";
+		$resArr = $this->db->getResultArray($queryStr);
+		if (!$resArr)
+			return false;
+
+		$versions = array();
+		foreach($resArr as $row) {
+			$document = new $this->classnames['document']($row['document'], '', '', '', '', '', '', '', '', '', '', '');
+			$document->setDMS($this);
+			$version = new $this->classnames['documentcontent']($row['id'], $document, $row['version'], $row['comment'], $row['date'], $row['createdBy'], $row['dir'], $row['orgFileName'], $row['fileType'], $row['mimeType'], $row['fileSize'], $row['checksum']);
+			if(!isset($versions[$row['dupid']])) {
+				$versions[$row['id']]['content'] = $version;
+				$versions[$row['id']]['duplicates'] = array();
+			} else
+				$versions[$row['dupid']]['duplicates'][] = $version;
+		}
+		return $versions;
+		
+	} /* }}} */
+
 	/**
 	 * Returns statitical information
 	 *
diff --git a/out/out.ObjectCheck.php b/out/out.ObjectCheck.php
index d4d16f42e..c0457c94b 100644
--- a/out/out.ObjectCheck.php
+++ b/out/out.ObjectCheck.php
@@ -62,10 +62,11 @@ $unlinkedfolders = $dms->checkFolders();
 $unlinkeddocuments = $dms->checkDocuments();
 $nofilesizeversions = $dms->getNoFileSizeDocumentContent();
 $nochecksumversions = $dms->getNoChecksumDocumentContent();
+$duplicateversions = $dms->getDuplicateDocumentContent();
 $rootfolder = $dms->getFolder($settings->_rootFolderID);
 
 $tmp = explode('.', basename($_SERVER['SCRIPT_FILENAME']));
-$view = UI::factory($theme, $tmp[1], array('dms'=>$dms, 'user'=>$user, 'folder'=>$folder, 'unlinkedcontent'=>$unlinkedversions, 'unlinkedfolders'=>$unlinkedfolders, 'unlinkeddocuments'=>$unlinkeddocuments, 'nofilesizeversions'=>$nofilesizeversions, 'nochecksumversions'=>$nochecksumversions, 'unlink'=>$unlink, 'setfilesize'=>$setfilesize, 'setchecksum'=>$setchecksum, 'repair'=>$repair, 'rootfolder'=>$rootfolder));
+$view = UI::factory($theme, $tmp[1], array('dms'=>$dms, 'user'=>$user, 'folder'=>$folder, 'unlinkedcontent'=>$unlinkedversions, 'unlinkedfolders'=>$unlinkedfolders, 'unlinkeddocuments'=>$unlinkeddocuments, 'nofilesizeversions'=>$nofilesizeversions, 'nochecksumversions'=>$nochecksumversions, 'duplicateversions'=>$duplicateversions, 'unlink'=>$unlink, 'setfilesize'=>$setfilesize, 'setchecksum'=>$setchecksum, 'repair'=>$repair, 'rootfolder'=>$rootfolder));
 if($view) {
 	$view->show();
 	exit;
diff --git a/views/bootstrap/class.ObjectCheck.php b/views/bootstrap/class.ObjectCheck.php
index d3c87b68c..a312d972f 100644
--- a/views/bootstrap/class.ObjectCheck.php
+++ b/views/bootstrap/class.ObjectCheck.php
@@ -172,6 +172,7 @@ class SeedDMS_View_ObjectCheck extends SeedDMS_Bootstrap_Style {
 		$unlinkeddocuments = $this->params['unlinkeddocuments'];
 		$nofilesizeversions = $this->params['nofilesizeversions'];
 		$nochecksumversions = $this->params['nochecksumversions'];
+		$duplicateversions = $this->params['duplicateversions'];
 		$repair = $this->params['repair'];
 		$unlink = $this->params['unlink'];
 		$setfilesize = $this->params['setfilesize'];
@@ -340,6 +341,34 @@ class SeedDMS_View_ObjectCheck extends SeedDMS_Bootstrap_Style {
 			}
 		}
 
+		$this->contentContainerEnd();
+
+		$this->contentHeading(getMLText("duplicate_content"));
+		$this->contentContainerStart();
+
+		if($duplicateversions) {
+			print "<table class=\"table-condensed\">";
+			print "<thead>\n<tr>\n";
+			print "<th>".getMLText("document")."</th>\n";
+			print "<th>".getMLText("version")."</th>\n";
+			print "<th>".getMLText("original_filename")."</th>\n";
+			print "<th>".getMLText("mimetype")."</th>\n";
+			print "</tr>\n</thead>\n<tbody>\n";
+			foreach($duplicateversions as $rec) {
+				$version = $rec['content'];
+				$doc = $version->getDocument();
+				print "<tr>";
+				print "<td>".$doc->getId()."</td><td>".$version->getVersion()."</td><td>".$version->getOriginalFileName()."</td><td>".$version->getMimeType()."</td>";
+				print "<td>";
+				foreach($rec['duplicates'] as $duplicate) {
+					print $duplicate->getVersion();
+				}
+				print "</td>";
+				print "</tr>\n";
+			}
+			print "</tbody></table>\n";
+		}
+
 		$this->contentContainerEnd();
 		$this->htmlEndPage();
 	} /* }}} */