AVETMISS error codes/4639
AVS error 4639
ErrorNAT00020Postcode
What it means
Triggers when the delivery-location Postcode is not a valid postcode (changed from a warning to an error).
How to fix it
Populate a valid 4-digit AU postcode (or OSPC for overseas).
Does RTObase catch this automatically?
Partly, RTObase catches the format and range problems locally; the exact match (e.g. postcode/suburb, or a training.gov.au lookup) is confirmed at fix time.
Got a whole report of errors? Explain them all at once.
Error explainer →Guidance only, not a substitute for lodgement. Meaning current as of July 2026; AVS rules and error/warning status can change between collection periods. Always re-validate in NCVER AVS before you submit.
Never see this error again
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