Updating Payment Method Scope/PMSource - Help Needed

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I am currently in the process of trying to update the payment method scopes within our company. I am trying to do so on an updatable baq. The baq is made from the paymethod table and includes company, name, pmuid, and PMSource. The Pm source is what I have made updateable in the baq. When I change the value and click update it says that it processed with no errors. However, the entry still retains its old scope. Has anyone had success changing these in the past?

That cannot be changed after the fact. If I recall correctly.