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You have the ability to give a user certain commission privileges however prevent them from making changes to important commission rules or commission setup features. 

Schedule exceptions: this includes the user to modify and add referrals, account groups, splits, addendums

Supplier import setup: this includes the user to modify and add matrixes, multi-supplier import setup, supplier import aliases, transfer setup

The 'Commission setup' privilege keeps: Supplier schedules, pay plans, which pay plan agency has, modifications, tolerances, product add/edit/trash, product matching, default columns, add/edit/trash/migrate commission variables.