SQLCA.SQLERRD[2] returns zero after PUT

IDS 11.50.FC6 4GL 7.50.FC1 I would improve the current 4gl that is running with direct insert by using declare->open->put.. But have a problem after PUT, if want to get the last serial no inserted into a table, but SQLCA.SQLERRD[2] just returns zero. Knowing PUT is to add rows into buffer then flush if it is full, so the serial no would not be generated before flush to table? any help with this? Thanks Gary