Have you cleared transactions in AP to History? If so, then there is no guarantee that the totals will match for a backdated AP report, because the Open Payables report can only print what exists in current transactions.
Receivables version 9.0x is different because the Aged Trial Balance was re-worked to select transactions that were current as of the report date, even if they have been subsequently cleared to History (but not purged from History). This is something we plan on doing to Payables in a future release, but can't yet because a significant data structure change is needed to allow this.
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Regards,
Softrak Tech Support