How to prevent creator of the subledger journal to approve his own journal

Summary:

When implemented "Exception-Based Approvals for Manual Subledger Entries", subledger journals ( Created manually or through spreadsheet) are going for approvals. Approval Routing is "Role" i.e. who ever having the custom role(XYZ Journal Approver) will approve the Subledger Journal.

However, system allows the Self-Approval i.e. a preparer can approve his/her own journals.

How to Prevent this?

For general ledger journals, there is "Prohibit User Self-Approval" available at BPM level

How to achieve this kind of functionality for "Subledger Journals" when Approval Routing is "Role"?

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