PO RESPONSE WORK FLOW - SRM SUS

Dear friends

We are confirming PO items from SUS , The XMl message generated fails in ebp with following error -

Exception occurredE:BBP_WFL:012 -No approval workflow found. Inform system administrator

We have activated event linakges for following workflow -

AppPCO_1stp 14500019

and also for -

AppPCO_0step 14500001

When a buyer also tries to create a PO response in EBP without changing any quantity it gets created successfully.

But When the byuer changes some quantity and submits a PO response even he gits the same error - No approval workflow found. Inform system administrator

please help me with your valuble solution\

sekhar