Hi, Cam,
We don't require that Ledger be 9.0 in order to use PO8.1A. PO8.1A is compatible with GL8.1A and GL9.0.
Although I suspect you can enter a negative Quick Receipt in the version of PO you are using, I really don't know for certain.
Softrak only supports PO at the 8.1A and higher versions.
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Regards,
Softrak Tech Support