diff --git a/include/class/acc_ledger_purchase.class.php b/include/class/acc_ledger_purchase.class.php
index b51668546..96463a209 100644
--- a/include/class/acc_ledger_purchase.class.php
+++ b/include/class/acc_ledger_purchase.class.php
@@ -1564,6 +1564,7 @@ class  Acc_Ledger_Purchase extends Acc_Ledger
                 // vat label
                 //--
                 $Tva=new ITva_Popup($this->db);
+                $Tva->id="e_march$i"."_tva_id";
                 $Tva->js="onblur=\"clean_tva($i);compute_ledger($i)\"";
                 $Tva->in_table=true;
                 $Tva->set_attribute('compute',$i);
diff --git a/include/class/acc_ledger_sale.class.php b/include/class/acc_ledger_sale.class.php
index e7f89d2c6..2576f97d6 100644
--- a/include/class/acc_ledger_sale.class.php
+++ b/include/class/acc_ledger_sale.class.php
@@ -1690,6 +1690,7 @@ EOF;
                 // vat label
                 //--
                 $Tva = new ITva_Popup($this->db);
+                $Tva->id="e_march$i"."_tva_id";
                 $Tva->in_table = true;
                 $Tva->set_attribute('compute', $i);
                 $Tva->set_filter("sale");
diff --git a/include/class/pre_op_ach.class.php b/include/class/pre_op_ach.class.php
index 3f942e16a..ffff36a89 100644
--- a/include/class/pre_op_ach.class.php
+++ b/include/class/pre_op_ach.class.php
@@ -379,7 +379,7 @@ class Pre_op_ach extends Pre_operation_detail
                $Tva=new ITva_Popup($ledger->db);
                $Tva->in_table=true;
                $Tva->set_attribute('compute',$i);
-
+               $Tva->id="e_march$i"."_tva_id";
                $Tva->js='onblur="format_number(this);clean_tva('.$i.');compute_ledger('.$i.')"';
                $Tva->value=$march_tva_id;
                $array[$i]['tva']=$Tva->input("e_march$i"."_tva_id");
diff --git a/include/class/pre_op_ven.class.php b/include/class/pre_op_ven.class.php
index f6c1cd5a2..d1a93cb06 100644
--- a/include/class/pre_op_ven.class.php
+++ b/include/class/pre_op_ven.class.php
@@ -366,7 +366,7 @@ class Pre_op_ven extends Pre_operation_detail
                 $Tva=new ITva_Popup($ledger->db);
                 $Tva->in_table=true;
                 $Tva->set_attribute('compute',$i);
-
+                $Tva->id="e_march$i"."_tva_id";
                 $Tva->js='onblur="format_number(this);clean_tva('.$i.');compute_ledger('.$i.')"';
                 $Tva->value=$march_tva_id;
                 $array[$i]['tva']=$Tva->input("e_march$i"."_tva_id");