Requisition approval by budget manager?

Summary:

I need to know which field to evaluate in the requisition approval configuration, so that each requisition is approved by the Budget Manager.

In the budget configuration, a Budget Manager is assigned.

In the requisition approvals, I can select either the 'Cost Center Manager' or the 'Funds Override Approver' to approve, but neither of these cases is applicable.

How can I make sure that the Budget Manager always approves the requisition?

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