diff --git a/htdocs/categories/categorie.php b/htdocs/categories/categorie.php
index 8232da94989..e3925ddb232 100644
--- a/htdocs/categories/categorie.php
+++ b/htdocs/categories/categorie.php
@@ -410,7 +410,7 @@ else if ($id || $ref)
 		// Ref
 		print '<tr><td width="20%">'.$langs->trans("Ref").'</td>';
 		print '<td class="valeur">';
-		print $form->showrefnav($member,'rowid');
+		print $form->showrefnav($member,'id');
 		print '</td></tr>';
 
         // Login
diff --git a/htdocs/core/lib/functions2.lib.php b/htdocs/core/lib/functions2.lib.php
index c315939d327..20af2917fa4 100644
--- a/htdocs/core/lib/functions2.lib.php
+++ b/htdocs/core/lib/functions2.lib.php
@@ -716,7 +716,7 @@ function get_next_value($db,$mask,$table,$field,$where='',$objsoc='',$date='',$m
     //print "masktri=".$masktri." maskcounter=".$maskcounter." maskraz=".$maskraz." maskoffset=".$maskoffset."<br>\n";
 
     // Define $sqlstring
-    $posnumstart=strpos($maskwithnocode,$maskcounter);	// Pos of counter in final string (from 0 to ...)
+    $posnumstart=strrpos($maskwithnocode,$maskcounter);	// Pos of counter in final string (from 0 to ...)
     if ($posnumstart < 0) return 'ErrorBadMaskFailedToLocatePosOfSequence';
     $sqlstring='SUBSTRING('.$field.', '.($posnumstart+1).', '.dol_strlen($maskcounter).')';
 
diff --git a/htdocs/product/class/product.class.php b/htdocs/product/class/product.class.php
index bd795845783..fbe46281e00 100644
--- a/htdocs/product/class/product.class.php
+++ b/htdocs/product/class/product.class.php
@@ -560,7 +560,7 @@ class Product extends CommonObject
 		if (empty($this->localtax2_tx))			$this->localtax2_tx = 0;
 		if (empty($this->status))				$this->status = 0;
 		if (empty($this->status_buy))			$this->status_buy = 0;
-
+		
         if (empty($this->country_id))           $this->country_id = 0;
 
         //Gencod
@@ -610,7 +610,7 @@ class Product extends CommonObject
 			$sql.= ", volume_units = " . ($this->volume_units!='' ? "'".$this->volume_units."'" : 'null');
 			$sql.= ", seuil_stock_alerte = " . ((isset($this->seuil_stock_alerte) && $this->seuil_stock_alerte != '') ? "'".$this->seuil_stock_alerte."'" : "null");
 			$sql.= ", description = '" . $this->db->escape($this->description) ."'";
-			$sql.= ", url = " . ($this->url?"'".$this->db->escape($this->url)."'":'');
+			$sql.= ", url = " . ($this->url?"'".$this->db->escape($this->url)."'":'null');
 			$sql.= ", customcode = '" .        $this->db->escape($this->customcode) ."'";
 	        $sql.= ", fk_country = " . ($this->country_id > 0 ? $this->country_id : 'null');
 	        $sql.= ", note = '" .        $this->db->escape($this->note) ."'";