Sequence Check Control. In system that use sequential master files (mostly legacy sytem), the order of the transaction records in the batch in critical to correct and complete processing. As the batch moves through the process, it must be re-sorted in the order of the master file used in each run. As out-of-sequence supplier’s in voice record in a batch will prevent other downstream record from bring processed . In more serious cases, the downstream record may be processed against the wrong suppliers’ accounts. A sequence check control needs to be in place to compare the sequence of each record in the batch with the previous record to ensure that proper sorting took place. Our-of-sequence record should be rejected and resubmitted. Thus allowing the other records in the batch to be processed.