This requisition line doesn't match any of the lines on the agreement. (PO-2055135)

Summary

This requisition line doesn't match any of the lines on the agreement. (PO-2055135)

Content

Scenario :

1. I want to use Process Requisitions to create the PO.

2. I use a smart form to enter the product categories 9we are not using items). 

3. The Req is approved. 

4. I then go to process requisitions and specify the sorce document BPA on the Document Builder after selecting the Req line.

5. I get the error : This requisition line doesn't match any of the lines on the agreement. (PO-2055135)

6. The Req line DOES match the BPA line.

 

Any tips? Is BPA not meant to be used for process requisitions? Does it only work for auto create PO?