Locking Problem with Online Support.

Morning All, I have a problem where a certain section of Code used for Locking works ok on Standard Engine 5.06 (-250), but on On-Line experiences a problem, as it gets a different Error Code returned, looking at the ISAM code of this new error code (-243 on Online) it indicates a locking problem. How many other error codes out represent a locking problem ?? How come the detection of a locking problem in Standard Engine does not work on Online ?? Any suggestions or help would be appreciated. Please find enclosed section of locking code :- LET g_error = -250 WHILE g_error = -250 WHENEVER ERROR CONTINUE CLOSE s01_daily_paymts OPEN s01_daily_paymts FETCH s01_daily_paymts INTO f_c_daily_paymts.* LET g_error = STATUS WHENEVER ERROR STOP IF g_error = -250 THEN MESSAGE "Record currently lock by another user, please wait ..." SLEEP 1 MESSAGE " " SLEEP 1 ELSE END IF END WHILE IF g_error != 0 THEN LET p_error_desc = "Unable to lock Payment Advice for Transfer" LET p_key_data = f_c_daily_paymts.advice USING "<<<<<<<", ", ", f_c_daily_paymts.contract_no CALL serious_error ( g_error, p_module, p_version, p_error_desc, p_key_data )