Modifying Order of Actions on screen within Mobile App

I have added the ‘Add PO Line’ action to the PO receipts screen on the mobile app by following the steps on the last few pages in the T410 manual.  This works great to add the lines and release the receipt.  To streamline the process, I would like to have the ‘Add PO Line’ action available on the Document Summary screen by default.  To explain further, if I update the ‘formActionsToExpand=’ to 4, then I have all actions appear at the bottom in this order: Hold, Assign, Release, Add PO Line.  If I update it to be ‘formActionsToExpand=’ to 2, I have Hold, Assign, … with the option to select … and Add PO Line.

How do I get it to be displayed as the following: Hold, Add PO Line, … on the document summary screen for the PO receipt?

It appears that when I added priority, listPriority and formPriority were not available options in current context.  I have also attempted to add the action, as I’ve done, then below it say update recordAction in attempt to reorder the actions.