After Releasing Work Order, PR is not generating. Getting Error "Supply Order Creation Failed becaus

Summary

We are using OSP Process. At the time of releasing work order, PR should get generate in Supply Orchestration, But it is going into Supply Lines Exception.

Content

We are using OSP Process. At the time of releasing work order, PR should get generate in Supply Orchestration, But it is going into Supply Lines Exception.

There we getting error message like : 

 

Supply Order Creation Failed because a Preparer was not Specified for the Transfer order or Purchase Order

 

FYI, we have all the procurement roles and access of Business Unit also having Procurement Agent.

Attached the screenshot of error for a reference.