PO Approval Rules- How to populate PO line level DFF value dynamically from BPA(Agreement Amount)

Summary

We want to write PO approval rule such that if there is BPA header level agreement amount corresponding PO should be Auto Approved

Content

Business Requirement: If there is BPA header level agreement amount , Auto approve concern POs otherwise follow the Approval matrix.

Background and activities so for:

1) We have Agreement Amount attribute on PO approval rule but that is not supported for PO (Purchase Order) approval, it works fine for BPA approvals.

2) We dont have any other attribute to capture BPA header level Agreement amount which can be used for PO approval

3) We have opened a DFF to capture value of BPA Agreement amount, if we enter value manually it works fine