Hi, Susan,
It sounds like what you're requesting is that we implement an Accounting Date in Purchase Orders, the way we have in Receivables 9.0A. I can certainly enter the suggestion to R&D for you.
Right now, if you want the date sent to GL from the invoice to be the posting date, you'll want to ensure the Vendor Document Date is that date and manually enter the true Due Date on the invoice as you suggested.
At present,
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Regards,
Softrak Tech Support