Approval Rules defined in BPM are not working

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Hi Experts ,

We have user Manage Purchasing Approvals UI to define the PO approval rule and later we find certain logics can be handled only in BPM  so we created new rules in BPM   ,but the rules  what we defined in BPM is not working and what we feel is that PO approval is working based on the approval rules that is defined using the Manage Purchasing Approvals UI. 

Do we need to run any jobs or how to make the rules defined in BPM to work? Kindy advise.

 

Thanks

Edwin