Most CRS reporting errors are not detected at submission. They are introduced earlier, when data is extracted from underlying systems and transformed into the OECD XML schema. A short, deliberate process avoids most of them.
1. Freeze the dataset
Extract the reportable-account dataset against a fixed cut-off. Working off a live extract during validation creates moving targets and reconciliation overhead.
2. Reconcile before transformation
Reconcile account counts, balances and controlling-person counts against the source system before generating XML. Differences are far easier to investigate at this stage than after the file has been built.
3. Validate against the schema
Run the generated XML through both the OECD schema and any local authority overlays. Treat warnings as errors during testing, even if the portal will accept them.
4. Submit, then archive
Submit through the appropriate authority portal and archive the submitted file alongside the acknowledgement and the reconciliation pack. If you need to file a correction next year, that bundle is what makes the work tractable.
