When the indicator source list requirement is maintained in the material master, the system will only allow creation of a purchase order if the source is maintained in the source list (t-code ME01). If its missing we will get an error message when creating or chaging PO with message :"Source not included in list despite source list req".
Is there a enhancement through which we can influence the error message for PO's of type stock transfter order? I tried searching for one but couldn't find a appropriate one.
Had look at ME_PROCESS_PO_CUST & ME_PROCESS_PO also but they were not much useful.