Access Codes

SOLVED

I need to restrict all fields besides the supplier section on products.

I assumed I could set the function GESITM to view only for this groups functional authorizations and then add an Access Code I created to the supplier fields and set that to allow modification. However when I try to modify one of the supplier fields I get a "Modification not possible" error. I have made sure to validate the ITP(Supplier Product) table I added the access codes to and still cannot modify.

Is this possible or is there a better way of doing this?