This statement requires an audit trail to work, but no current audit trail exists for the table. Either none was ever started, or it was dropped. Check that you specified the table you intended. In a recovery situation (the statement was RECOVER TABLE), check that the table has just been restored from a backup copy. If so, the table did not have an audit trail at the time that this backup was made. If an audit trail was specified later, an unknown period remains between the backup and the start of auditing during which unaudited updates might have been made.