Inv Approval Service is not defined Error while reasing AP25.Any know why?

Sounds like the Process Flow Service is not defined and/or enabled. In order for LSF to trigger a Process Flow, it needs a Service linked to a Process. For Landmark/IPA, you can create or enable the Service in Rich Client, then assign a Process. In LSF 9.0.1, that would be done in the BPM ProcessFlow Admin.

Appreciate your help.

THats is absolutely right ,And I have dialed the Workflow ,this helped ,me to do this with out using IPA