How to change logic behind association between BPA Line and PO line

Summary:

Change logic if there are more BPA lines for one PO line

Content (please ensure you mask any confidential information):

I would like to know if there is the possibility to change the logic behind the association between BPA lines and PO line. In particular, if I have two purcase agreement lines for same PO line, I have seen that the system associates the BPA which were created before. Is there a way to change this logic?

For example, I would like the system associates the last BPA created or the BPA which has the lowest price.

Version (include the version you are using, if applicable):