Hi, Susan,
Thank you for the added detail. We'll do some extra testing with the multi-user environment. Although testing has already been done in this area, it's doubtful that your exact situation was tested. Getting this set up may take some time though. I will come back to the issue when we've had time to complete some more testing.
Other than the Receipt that User 1 posted for Vendor 2 that had previously been Receipt-DN only, all other documents were created in PO8.1C?
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Regards,
Softrak Tech Support