Hi Jim,
This is still an issue for us and we put a ticket in SAP.
SAP contacted us and noted that this is an issue for a lot of people.
As of right now SAP is looking at our setup and trying to find a solution.
I recommend creating a ticket with SAP so a least they start to take a look in your system.
To navigate to ME51N in NWBC- I set up roles and assign transaction in SU01. When staff logs into NWBC they will only see what they are assigned.
Please let me know if you need further help