Group multiple requisition lines into a single PO

Summary:

Ability to convert both BPA requisition lines and Negotiated requisition lines to the same PO

Content (please ensure you mask any confidential information):

We have a requisition which has 2 lines:

Line 1 is associated to a BPA, Line 2 is not (Negotiated flag = Yes).

Both lines are having the same Supplier and Site, same Buyer.

In our Procurement Business Function: Option "Autogenerate orders from requisition lines sourced to agreements" and "Autogenerate orders from requester-negotiated requisition lines" are both checked.

Once the requisition is approved, Line 1 is auto converted to PO 1 while Line 2 is converted to another PO 2.

Our expectation is both lines should go to the same PO, how to make it happen?