VATREC7042 - Computer invoicing: Procedures for testing EDI invoicing systems: What you need to establish

You need to ensure that:

• The system produces complete and accurate data;
• Data cannot be lost or corrupted (or at least such failures are detected and recorded) when being transmitted or received and that updating is complete and accurate;
• Adequate file-level controls exist to verify the completeness and accuracy of data, to prevent the processing of duplicate transmissions and to ensure that only authorised data is transmitted; and
• All departmental requirements can be met.