Restrict the Supplier and Supplier site LOV in the Purchase Order Screen based on the Group assigned

Summary: Restrict the Supplier and Supplier site LOV in the Purchase Order Screen based on the Group assigned to the logged in user which is stored in Lookups.

Content (please ensure you mask any confidential information):We have 2 lookups created
1] For storing the Groups which users are assigned to

2] For storing eligible supplier and supplier site for the groups created in Lookup

We have to restrict the Supplier site and supplier LOV when we create an Purchase Order on the basis of this Group (logged in user assigned to). It should only show the supplier and supplier site for which there are entries in the 2nd lookup.