Security to limit user to specific Business Unit (MCU)

I need to know how to set security to limit a user to a specific business unit (field MCU in table F0006). I have tried to set Row security but it doesn't seem to be working.
I am on ERP 8.0, SP 23 G1.

Every table where you want this secured needs to have Row security setup. For instance there is a business unit field in the Account Balance (F0902) file. Which ever table is driving a view for whatever option you want to secure, needs to have row security setup.

As per Jean, we setup row security to duplicate World's Business Unit security. The files we identified were:

F0006, F0901, F0902, F0911, F4301, F4311, F43121, and F4209.

Grant.