diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 08391a4a797..367ca1cc813 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -3230,7 +3230,10 @@ abstract class CommonObject
 			// Specific code for backward compatibility with old field names
 			if ($this->element == 'facture' || $this->element == 'facturerec')             $fieldht = 'total';
 			if ($this->element == 'facture_fourn' || $this->element == 'invoice_supplier') $fieldtva = 'total_tva';
-			if ($this->element == 'propal')                                                $fieldttc = 'total';
+			if ($this->element == 'propal') {
+				$fieldttc = 'total';
+				$fieldtva = 'total_tva';
+			}
 			if ($this->element == 'expensereport')                                         $fieldtva = 'total_tva';
 			if ($this->element == 'supplier_proposal')                                     $fieldttc = 'total';