Missing custom field in EDIT ROW form

I added a custom field ‘Supplier’ in Material Request Item form.

However, when I am trying to edit the item in Material Request table, the field does not seem to appear:


Workflow:
Create Sales Order → From Sales Order, request for raw materials → Material Request created → want to modify supplier for each material request item

Please help. Thanks

fields in a submitted document can become hidden if they have no value.

My goal is to create a material request with raw materials fetched from the exploded BOMs of the SKUs in the sales order. Each raw material from this BOM has a different supplier, and from this purchase order, i want to create Purchase Orders to each supplier automatically.

So i have to select the supplier for each raw material

How can i customize this dialog, is it from the code?

Sales Order → Request for Raw materials: