Auto Approval not happening for purchase order sourced from BPA

Summary

Auto Approval not happening for purchase order sourced from BPA

Content

Hello,

We created a purchase order from a blanket and submitted it. The status is Pending Approval instead of Open . PO should have been  Auto Approved as all lines are negotiated. 

Earlier the functionality was working fine.  Please help to resolve this issue.

Thanks

Siva.

Version

18 C