Supplier Instant authorization view - No access to update PO ref - App10 IEE

I wonder if there any way to give user access to update PO ref in supplier invoice view ‘Instant authorization’. I can give access to view ‘Posting proposal’ but the problem is two:

1. it’s not user friendly in any way
2. Have to grant access to view ‘Manual supplier invoice’ as well.

Same issue for all my customer who using App10 IEE.

Anyone who have the same experience and does anyone have any idea how to solve it?