diff --git a/include/class/class_pre_op_ach.php b/include/class/class_pre_op_ach.php
index 356c0268a..2c8ce3151 100644
--- a/include/class/class_pre_op_ach.php
+++ b/include/class/class_pre_op_ach.php
@@ -352,6 +352,7 @@ class Pre_op_ach extends Pre_operation_detail
             $array[$i]['denom']=$Span->input("e_march".$i."_label",$march_label);
             // price
             $Price=new INum();
+            $Price->prec=4;
             $Price->setReadOnly(false);
             $Price->size=9;
             $Price->javascript="onBlur='format_number(this);clean_tva($i);compute_ledger($i)'";
diff --git a/include/class/class_pre_op_ven.php b/include/class/class_pre_op_ven.php
index 186e8102d..5c386a5c3 100644
--- a/include/class/class_pre_op_ven.php
+++ b/include/class/class_pre_op_ven.php
@@ -345,6 +345,7 @@ class Pre_op_ven extends Pre_operation_detail
             // price
             $Price=new INum();
             $Price->setReadOnly(false);
+            $Price->prec=4;
             $Price->size=9;
             $Price->javascript="onBlur='format_number(this);clean_tva($i);compute_ledger($i)'";
             $array[$i]['pu']=$Price->input("e_march".$i."_price",$march_price);