With the current transmission flat file 997, The carrier transmitts immediately after receiving a transmission information which designates errors by record line, claim segment and data element. However you do not identify which data refers to which data that was transmitted. In other words you tell the sender that he has errors but not what claim it pertails to. With large numbers of claims involved we are currently reduced to counting lines and /or calling the carrier and asking for help in identifying the errors.
It would be far simplier if you added the claim number/claim account number or even the patient name for identification purposes.