Problem in Lookup field in Sub Form

i am having a Sub Form in a main form.

The Lookup Field in Sub Form is baased on a value from the main form.SO while adding i dont have any issues the Lookup field works good

But if i try to edit that drop down field its showing all values in the LookUp rather than the fiterd value

Seeking a solution for that.

Code for Subform

On Add Row

if (row.Order_No == null)

{

ord = (Order_Management[((Client_Name == input.Client_Name && Rate_Id == input.Rate_Id) && Order_Status == "Active")].ID).getall();

row.Order_No:ui.add(ord);

}