Category based Approved Supplier List to be used to limit Suppliers on Purchase orders

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My query is to limit the procurement of some items against some approved supplier.

For this requirement, we are using the ASL concept.

The issue is, In ASL we are using the supplier-category combination for procurement BU with Global Scope. But when we are procuring the same category from another supplier, System is not validating the ASL and PO is getting generated.

As per ASL, we should not be able to generate the purchase order from another supplier which is not in ASL.

Same scenario if we tested with Supplier Item combination, it is working fine after enabling the "