SES posting via worklfow is failing

Question

Hi,
Our SES acceptance workflow is failing to post an SES and returning error 'Field ESSR-BUDAT. is not an input field'. It uses a custom method from BO ZBUS2091, calling BDC in call transaction mode, calling txn ML81. The BDC returns the above message post execution.
It is not getting replicated across any of the other systems. When I ran the BDC in mode 'A' in our test system, then this message is replicated only for the cases where the SES is in accepted state (as ML81 is obviously not expecting posting date or other fields as input since the SES is already accepted).
I also referred the forum thread 'ESSR-BUDAT (Posting date) field not an input field' however, this config is already present in SPR.
(P.S. Our system is recently upgraded to SPS9 service pack, however, the SPS team claims it is not an upgrade effect.)
Please advice, thanks heaps.
Rgds,
Sagar

Answer 1

All,
The issue was that whenever the SES had an associated PR created from SRM (Contract) the service line item picked up the external ID field. This field gets greyed out whenever the posting is done via ML81 (BDC Call transaction) - this is as per the SAP logic implemented in SPS 9 upgrade pack. However, the BDC expects the field to be an input field, causing an error while posting.
SAP has given a pilot OSS 1528756, causing Posting date field to be input always.
Rgds,
Sagar