Credit memo workflow fails to create credit memo, with no error message. I noticed the Workflow node (ARAMECM) is calling AR_AME_CMWF_API.CALLTRXAPI which in turn is calling 'arw_cmreq_cover.ar_autocreate_cm'. This autocreate_cm procedure is returning an error 'e_unexpected_error'. Tried Resubmit request and everytime it fails to create a credit memo, with no error message in the notification. This doesn't happen with all the requests.
Checked the autonumbering setup and it is ok. For the same combination of batch source, credit method rules, credit method installments, some requests goes through and some fail. Verified metalink note 373569.1 and is not applicable for this scenario.