diff --git a/SeedDMS_Core/Core/inc.ClassFolder.php b/SeedDMS_Core/Core/inc.ClassFolder.php
index 11cb88026..f0a3b092a 100644
--- a/SeedDMS_Core/Core/inc.ClassFolder.php
+++ b/SeedDMS_Core/Core/inc.ClassFolder.php
@@ -2068,6 +2068,40 @@ class SeedDMS_Core_Folder extends SeedDMS_Core_Object {
 		return $resArr[0];
 	} /* }}} */
 
+	/**
+	 * Reorder documents of folder
+	 *
+	 * Fix the sequence numbers of all documents in the folder, by assigning new
+	 * numbers starting from 1 incrementing by 1. This can be necessary if sequence
+	 * numbers are not unique which makes manual reordering for documents with
+	 * identical sequence numbers impossible.
+	 *
+	 * @return bool false in case of an error, otherwise true
+	 */
+	function reorderDocuments() { /* {{{ */
+		$db = $this->_dms->getDB();
+
+		$queryStr = "SELECT `id` FROM `tblDocuments` WHERE `folder` = " . (int) $this->_id;
+		$resArr = $db->getResultArray($queryStr);
+		if (is_bool($resArr) && $resArr == false)
+			return false;
+
+		$db->startTransaction();
+		$no = 1.0;
+		foreach($resArr as $doc) {
+			$queryStr = "UPDATE `tblDocuments` SET `sequence` = " . $no . " WHERE `id` = ". $doc['id'];
+			if (!$db->getResult($queryStr)) {
+				$db->rollbackTransaction();
+				return false;
+			}
+			$no += 1.0;
+		}
+		$db->commitTransaction();
+
+		return true;
+	} /* }}} */
+
+
 }
 
 ?>
diff --git a/SeedDMS_Core/package.xml b/SeedDMS_Core/package.xml
index 1b514eec2..5f75fd99e 100644
--- a/SeedDMS_Core/package.xml
+++ b/SeedDMS_Core/package.xml
@@ -29,7 +29,7 @@
 - SeedDMS_Core_DMS::createPasswordRequest() creates a cryptographically secure hash
 - fix sql error when deleting a folder attribute
 - add SeedDMS_Core_Attribute::getParsedValue() and use it in SeedDMS_Core_Object::getAttributeValue()
-- add SeedDMS_Core_DMS::getDuplicateSequenceNo()
+- add SeedDMS_Core_DMS::getDuplicateSequenceNo() and SeedDMS_Core_Folder::reorderDocuments()
  </notes>
  <contents>
   <dir baseinstalldir="SeedDMS" name="/">