BPA Price Revision for Long-Term Requisitions

Summary:

We have the following business scenario:

There is BPA #1 where Item A price is 10 USD.
Every quarter the price is reviewed and increased, for example by 5 USD.

Business process is to create one large requisition, for example for 10,000 pcs, with the expectation that releases/POs will be created from it during the next 6 months.

As a result, the requisition was created based on BPA #1 with price 10 USD.
However, after 3 months the new price becomes 15 USD.

For example, we create BPA #2 where Item A price is already 15 USD.
Question: how can BPA #2 be linked/pulled into the already approved PO/requisition instead of BPA #1?