diff --git a/htdocs/accountancy/bookkeeping/card.php b/htdocs/accountancy/bookkeeping/card.php
index f8fa0774400..ba4c7260519 100644
--- a/htdocs/accountancy/bookkeeping/card.php
+++ b/htdocs/accountancy/bookkeeping/card.php
@@ -41,7 +41,7 @@ $action = GETPOST('action', 'aZ09');
 $optioncss = GETPOST('optioncss', 'aZ'); // Option for the css output (always '' except when 'print')
 
 $id = GETPOST('id', 'int'); // id of record
-$mode = GETPOST('mode', 'aZ09'); // '' or 'tmp'
+$mode = GETPOST('mode', 'aZ09'); // '' or '_tmp'
 $piece_num = GETPOST("piece_num", 'int'); // id of transaction (several lines share the same transaction id)
 
 // Security check
diff --git a/htdocs/accountancy/class/bookkeeping.class.php b/htdocs/accountancy/class/bookkeeping.class.php
index 0162a98394e..a700ebecb1b 100644
--- a/htdocs/accountancy/class/bookkeeping.class.php
+++ b/htdocs/accountancy/class/bookkeeping.class.php
@@ -1127,7 +1127,7 @@ class BookKeeping extends CommonObject
 	 *
 	 * @param  User    $user       User that modifies
 	 * @param  bool    $notrigger  false=launch triggers after, true=disable triggers
-	 * @param  string  $mode       Mode
+	 * @param  string  $mode       Mode ('' or _tmp')
 	 * @return int                 <0 if KO, >0 if OK
 	 */
     public function update(User $user, $notrigger = false, $mode = '')
@@ -1254,12 +1254,12 @@ class BookKeeping extends CommonObject
 	}
 
 	/**
-	 * Update movement
+	 * Update accounting movement
 	 *
 	 * @param  string  $piece_num      Piece num
 	 * @param  string  $field          Field
 	 * @param  string  $value          Value
-	 * @param  string  $mode           Mode
+	 * @param  string  $mode           Mode ('' or _tmp')
 	 * @return number                  <0 if KO, >0 if OK
 	 */
 	public function updateByMvt($piece_num = '', $field = '', $value = '', $mode = '')
@@ -1268,9 +1268,9 @@ class BookKeeping extends CommonObject
 
 		$this->db->begin();
 
-		$sql = "UPDATE ".MAIN_DB_PREFIX.$this->table_element.$mode." as ab";
-		$sql .= ' SET ab.'.$field.'='.(is_numeric($value) ? $value : "'".$this->db->escape($value)."'");
-		$sql .= ' WHERE ab.piece_num='.$piece_num;
+		$sql = "UPDATE ".MAIN_DB_PREFIX.$this->table_element.$mode;
+		$sql .= ' SET '.$field.'='.(is_numeric($value) ? $value : "'".$this->db->escape($value)."'");
+		$sql .= " WHERE piece_num = '".$this->db->escape($piece_num)."'";
 		$resql = $this->db->query($sql);
 
 		if (!$resql) {