Limit Link field selection option based on Link field value

ERPNext
1

I have a Custom Field in Item DocType with a select field : Type A and Type B.

Now to my BOM DocType I want the user to able to select in Item Link field only from Type A
and Materials from Item Type B only …

2

You have to edit write custom code for this Currently item code comes in BOM based on erpnext/bom.js at develop · frappe/erpnext · GitHub

3

Yes I could do that but … no version control to that choice and that is why I have added Custom Field.

4

Is there any way to do this yet?

if I have doctype CustomDoc field type link to doctype “Supplier”

can I not limit selection results of Supplier where Supplier.somevalue = true ?