How do you default CPA in requisition line for category that has been defined in ASL and with CPA wi

Contract source document is not defaulted on the Requisition even when ASL/CPA defined.
Steps to reproduce:

1. Create a contract agreement for the supplier.

2. Create ASL for a category with above supplier and associate the contract agreement.

3. Create sourcing rule for the supplier and associate the category.

4. Create a requisition for the category.

5. Set 'Use Contract Agreements for Auto Sourcing' = NO AND 'Include Non-Catalogue Request' = NO for Purchase Requisition Document Type.

6. Set profile PO: Automatic Document Sourcing = NO.

Contract agreement does not default as source document.

Requirement: We only want PR to be automatically sourced from CPA and be automatically created as a PO if we explicitly defined the category in the ASL and associate a CPA against them. How can we achieve this?