MMICore : fix usercancreate invoice excess

htdocs/compta/facture/card.php

@@ -5556,7 +5556,7 @@ if ($action == 'create') {
 				}
 
 				// For standard invoice with excess received
-				if (($object->type == Facture::TYPE_STANDARD || $object->type == Facture::TYPE_SITUATION) && $object->statut == Facture::STATUS_VALIDATED && empty($object->paye) && $resteapayer < 0 && $usercancreate && empty($discount->id)) {
+				if (($object->type == Facture::TYPE_STANDARD || $object->type == Facture::TYPE_SITUATION) && $object->statut == Facture::STATUS_VALIDATED && empty($object->paye) && $resteapayer && $usercancreate && empty($discount->id)) {
 					print '<a class="butAction'.($conf->use_javascript_ajax ? ' reposition' : '').'" href="'.$_SERVER["PHP_SELF"].'?facid='.$object->id.'&amp;action=converttoreduc">'.$langs->trans('ConvertExcessReceivedToReduc').'</a>';
 				}
 				// For credit note