Trying again, I think this text was dropped from the original message.
The 989 error is being thrown in Smarconnect. We changed our shipping methods because UPS changed our account number. What other tables store the SHIPMTHD that need to be updated to reflect the change? The SY03000 has the correct info now. And the edits were all done using GP, not touching data directly.
It may be that SHIPMTHD data stored elsewhere is being used as parameters to procedures, that now have no matching record in SY03000.
It's GP 18.4, there was no option for it.
Thanks,