This functionality is new as of version 4.2.
In order to have access to Add Delivery Items:
One of the following must apply:
The User is assigned to the Destination Inventory Area (Hospital Unit), and has the 'Purchase Order' Elevated Privilege; OR,
The User is a member of a Security Role that is assigned to the Destination Inventory Area (Hospital Unit), and has the 'Purchase Order' Elevated Privilege.
Refer to: