Not able to add 'Budget Manager' role as a representative in InFinApInvoiceApproval

Summary:

InFinApInvoiceApproval  BPM Workflow, we would like to add a block to the current workflow for financial partner based on the HCM areas of responsibility (AOR's). It was the "budget manager" role on the HCM side. Can we add 'Budget Manager' as a representative instead of Application role.                                       Not able to add 'Budget Manager' role as a representative, it is throwing an error 'Getrepresentative function is not available'. Is there any other way to add 'Budget Manager'. Please suggest.

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