diff --git a/htdocs/compta/facture/card.php b/htdocs/compta/facture/card.php
index 0b38c4eb7e7..d08c69e7638 100644
--- a/htdocs/compta/facture/card.php
+++ b/htdocs/compta/facture/card.php
@@ -302,11 +302,13 @@ if (empty($reshook))
 			// Note: Other solution if you want to add a negative line on invoice, is to create a discount for customer and consumme it (but this is possible on standard invoice only).
 			$array_of_total_ht_per_vat_rate = array();
 			$array_of_total_ht_devise_per_vat_rate = array();
-			foreach($object->lines as $line) {
-				if (empty($array_of_total_ht_per_vat_rate[$line->tva_tx.'_'.$line->vat_src_code])) $array_of_total_ht_per_vat_rate[$line->tva_tx.'_'.$line->vat_src_code] = 0;
-				if (empty($array_of_total_ht_devise_per_vat_rate[$line->tva_tx.'_'.$line->vat_src_code])) $array_of_total_ht_devise_per_vat_rate[$line->tva_tx.'_'.$line->vat_src_code] = 0;
-				$array_of_total_ht_per_vat_rate[$line->tva_tx.'_'.$line->vat_src_code] += $line->total_ht;
-				$array_of_total_ht_devise_per_vat_rate[$line->tva_tx.'_'.$line->vat_src_code] += $line->multicurrency_total_ht;
+			foreach ($object->lines as $line) {
+				//$vat_src_code_for_line = $line->vat_src_code;		// TODO We chek sign of total per vat without taking into account the vat code because for the moment the vat code is lost/unknown when we add a down payment.
+				$vat_src_code_for_line = '';
+				if (empty($array_of_total_ht_per_vat_rate[$line->tva_tx.'_'.$vat_src_code_for_line])) $array_of_total_ht_per_vat_rate[$line->tva_tx.'_'.$vat_src_code_for_line] = 0;
+				if (empty($array_of_total_ht_devise_per_vat_rate[$line->tva_tx.'_'.$vat_src_code_for_line])) $array_of_total_ht_devise_per_vat_rate[$line->tva_tx.'_'.$vat_src_code_for_line] = 0;
+				$array_of_total_ht_per_vat_rate[$line->tva_tx.'_'.$vat_src_code_for_line] += $line->total_ht;
+				$array_of_total_ht_devise_per_vat_rate[$line->tva_tx.'_'.$vat_src_code_for_line] += $line->multicurrency_total_ht;
 			}
 
 			//var_dump($array_of_total_ht_per_vat_rate);exit;