Just to round out this thread, here's the rest of the thread Deb and I had.I just ran some additional tests, I created a privilege with the following permissions:
Menu Item Display:
ProjProjectsListPage – Read
ProjTableAuto – Read
PurchTableListPageProject – Read
ProjTable – Delete
When I launched the Security Development Tool for this privilege I can get to the Purchase Orders option under Item Tasks.
Now if I remove the access from the PurchTableListPageProject permission, the option for Manage is taken away completely.
So it appears that this option is controlled by the access to the PurchTableListPageProject menu item display.
Just to check, I ran a role access report for this object within our Fastpath tool and found that both the Project Assistant and Buying Agent role have this access (at least in our AX 2012 R2 environment).
These appear to be the only out of box roles that have this access.
If you've found this thread useful, dive deeper into User Group community content by role