Restrict values of a specific DFF field on the value entered in another DFF field

Summary:

Hi Oracle Community,

I have asked a similar question with regards to Category Names but this is slightly different as it is regarding two DFF fields with standard Value Sets.

I would appreciate some direction on the below please:

We use Smart Forms. We have one for Goods and one for Services for each BU.

We have one Functional Area Catalog with all procurement categories included in the “Procurement” Functional Area.

These Catalogs are assigned to each Smart Form and a User can pick any Category.

We have recently introduced a DFF field named “Department” which contains a Value Set of Departmental values.