I am running GP 2015 14.00.1026 and recently applied a January 2017 hotfix update to the system. After applying the update, users (including SA) cannot preview attached documents on the vendor card. We can, however, attach documents, but once attached they are locked there from deletion and viewing.
The problem also exists within the Vendor Documents (Invoices), AR cards, and AR Documents. Please see the picture of what is shown when attempting to view an attached document.
I believe the problem is a permissions issue where a permission is not being set. Though, I do not know which permission is required here.
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