How do I disable Supplier Site: Bank Account Tab

Until recently, our Supplier Sites Bank Account tab has been unavailable to most of our Payables Responsibilities, (which all share the same menu - but have different menu exclusions). I am trying to understand how the exclusion is set up.

Comparing one of our test environments to another, both have the added menu function of "Bank Account Access: Supplier Assignment", but neither have a Responsibility Menu exclusion relating to this same function. In one environment the tab is "greyed out" and in the other the Bank Account tab is available???

Does anyone know if I am missing another way of disabling this function?