diff --git a/htdocs/categories/class/categorie.class.php b/htdocs/categories/class/categorie.class.php
index 61bcbac238c..8e98e0014e8 100644
--- a/htdocs/categories/class/categorie.class.php
+++ b/htdocs/categories/class/categorie.class.php
@@ -1717,6 +1717,6 @@ class Categorie extends CommonObject
 			'categorie_societe'
 		);
 
-		return CommonObject::commonReplaceThirdparty($db, $origin_id, $dest_id, $tables);
+		return CommonObject::commonReplaceThirdparty($db, $origin_id, $dest_id, $tables, 1);
 	}
 }
diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index c26251f2312..15272a19d6c 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -4474,20 +4474,24 @@ abstract class CommonObject
 	 * This function is meant to be called from replaceThirdparty with the appropiate tables
 	 * Column name fk_soc MUST be used to identify thirdparties
 	 *
-	 * @param DoliDB 	$db 			Database handler
-	 * @param int 		$origin_id 		Old thirdparty id (the thirdparty to delete)
-	 * @param int 		$dest_id 		New thirdparty id (the thirdparty that will received element of the other)
-	 * @param string[] 	$tables 		Tables that need to be changed
+	 * @param  DoliDB 	   $db 			  Database handler
+	 * @param  int 		   $origin_id     Old thirdparty id (the thirdparty to delete)
+	 * @param  int 		   $dest_id       New thirdparty id (the thirdparty that will received element of the other)
+	 * @param  string[]    $tables        Tables that need to be changed
+	 * @param  int         $ignoreerrors  Ignore errors. Return true even if errors. We need this when replacement can fails like for categories (categorie of old thirdparty may already exists on new one) 
 	 * @return bool
 	 */
-	public static function commonReplaceThirdparty(DoliDB $db, $origin_id, $dest_id, array $tables)
+	public static function commonReplaceThirdparty(DoliDB $db, $origin_id, $dest_id, array $tables, $ignoreerrors=0)
 	{
 		foreach ($tables as $table)
 		{
 			$sql = 'UPDATE '.MAIN_DB_PREFIX.$table.' SET fk_soc = '.$dest_id.' WHERE fk_soc = '.$origin_id;
 
-			if (!$db->query($sql)) {
-				return false;
+			if (! $db->query($sql)) 
+			{
+			    if ($ignoreerrors) return true;
+				//$this->errors = $db->lasterror();
+			    return false;
 			}
 		}
 
diff --git a/htdocs/langs/en_US/errors.lang b/htdocs/langs/en_US/errors.lang
index ba9debb49ba..5d4ea34ded4 100644
--- a/htdocs/langs/en_US/errors.lang
+++ b/htdocs/langs/en_US/errors.lang
@@ -169,6 +169,7 @@ ErrorSavingChanges=An error has ocurred when saving the changes
 ErrorWarehouseRequiredIntoShipmentLine=Warehouse is required on the line to ship
 ErrorFileMustHaveFormat=File must have format %s
 ErrorSupplierCountryIsNotDefined=Country for this supplier is not defined. Correct this first.
+ErrorsThirdpartyMerge=Failed to merge the two records. Request canceled.
 
 # Warnings
 WarningPasswordSetWithNoAccount=A password was set for this member. However, no user account was created. So this password is stored but can't be used to login to Dolibarr. It may be used by an external module/interface but if you don't need to define any login nor password for a member, you can disable option "Manage a login for each member" from Member module setup. If you need to manage a login but don't need any password, you can keep this field empty to avoid this warning. Note: Email can also be used as a login if the member is linked to a user.  
diff --git a/htdocs/societe/class/societe.class.php b/htdocs/societe/class/societe.class.php
index a329a640d5d..69262715b31 100644
--- a/htdocs/societe/class/societe.class.php
+++ b/htdocs/societe/class/societe.class.php
@@ -1002,14 +1002,16 @@ class Societe extends CommonObject
      *    @param    string	$idprof2		Prof id 2 of third party (Warning, this can return several records)
      *    @param    string	$idprof3		Prof id 3 of third party (Warning, this can return several records)
      *    @param    string	$idprof4		Prof id 4 of third party (Warning, this can return several records)
+     *    @param    string	$idprof5		Prof id 5 of third party (Warning, this can return several records)
+     *    @param    string	$idprof6		Prof id 6 of third party (Warning, this can return several records)
      *    @return   int						>0 if OK, <0 if KO or if two records found for same ref or idprof, 0 if not found.
      */
-    function fetch($rowid, $ref='', $ref_ext='', $ref_int='', $idprof1='',$idprof2='',$idprof3='',$idprof4='')
+    function fetch($rowid, $ref='', $ref_ext='', $ref_int='', $idprof1='',$idprof2='',$idprof3='',$idprof4='',$idprof5='',$idprof6='')
     {
         global $langs;
         global $conf;
 
-        if (empty($rowid) && empty($ref) && empty($ref_ext) && empty($ref_int) && empty($idprof1) && empty($idprof2) && empty($idprof3) && empty($idprof4)) return -1;
+        if (empty($rowid) && empty($ref) && empty($ref_ext) && empty($ref_int) && empty($idprof1) && empty($idprof2) && empty($idprof3) && empty($idprof4) && empty($idprof5) && empty($idprof6)) return -1;
 
         $sql = 'SELECT s.rowid, s.nom as name, s.name_alias, s.entity, s.ref_ext, s.ref_int, s.address, s.datec as date_creation, s.prefix_comm';
         $sql .= ', s.status';
@@ -1049,9 +1051,11 @@ class Societe extends CommonObject
         else if ($ref_int) $sql .= " WHERE s.ref_int = '".$this->db->escape($ref_int)."' AND s.entity IN (".getEntity($this->element, 1).")";
         else if ($idprof1) $sql .= " WHERE s.siren = '".$this->db->escape($idprof1)."' AND s.entity IN (".getEntity($this->element, 1).")";
         else if ($idprof2) $sql .= " WHERE s.siret = '".$this->db->escape($idprof2)."' AND s.entity IN (".getEntity($this->element, 1).")";
-        else if ($idprof3) $sql .= " WHERE s.ape = '".$this->db->escape($idprof3)."' AND s.entity IN (".getEntity($this->element, 1).")"; 		// TODO This request is used ? Multiple database recording provided !!
+        else if ($idprof3) $sql .= " WHERE s.ape = '".$this->db->escape($idprof3)."' AND s.entity IN (".getEntity($this->element, 1).")";
         else if ($idprof4) $sql .= " WHERE s.idprof4 = '".$this->db->escape($idprof4)."' AND s.entity IN (".getEntity($this->element, 1).")";
-
+        else if ($idprof5) $sql .= " WHERE s.idprof5 = '".$this->db->escape($idprof5)."' AND s.entity IN (".getEntity($this->element, 1).")";
+        else if ($idprof6) $sql .= " WHERE s.idprof6 = '".$this->db->escape($idprof6)."' AND s.entity IN (".getEntity($this->element, 1).")";
+        
         $resql=$this->db->query($sql);
         dol_syslog(get_class($this)."::fetch ".$sql);
         if ($resql)
@@ -1059,11 +1063,11 @@ class Societe extends CommonObject
             $num=$this->db->num_rows($resql);
             if ($num > 1)
             {
-                $this->error='Fetch several records found request';
+                $this->error='Fetch found several records. Rename one of tirdparties to avoid duplicate.';
                 dol_syslog($this->error, LOG_ERR);
                 $result = -2;
             }
-            if ($num)
+            elseif ($num)   // $num = 1
             {
                 $obj = $this->db->fetch_object($resql);
 
diff --git a/htdocs/societe/soc.php b/htdocs/societe/soc.php
index fa1f52a06df..fb758c52f29 100644
--- a/htdocs/societe/soc.php
+++ b/htdocs/societe/soc.php
@@ -168,6 +168,7 @@ if (empty($reshook))
 					if (!$errors && !$object_name::replaceThirdparty($db, $soc_origin->id, $object->id))
 					{
 						$errors++;
+						setEventMessages($db->lasterror(), null, 'errors');
 					}
 				}
 
@@ -202,6 +203,7 @@ if (empty($reshook))
 				} 
 				else 
 				{
+				    $langs->load("errors");
 					setEventMessages($langs->trans('ErrorsThirdpartyMerge'), null, 'errors');
 					$db->rollback();
 				}