Approval based on Supplier when Supplier is different than that of Requisition.

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Hello Experts

Need suggestion on how to write PO approval rule based on below requirement.

A requisition contains suggester supplier. Requisition goes through approval. When this requisition is processed manually by buyer and if buyer changes the suggested supplier, then we want to trigger a PO approval rule.

P.S: we do have PO approval rule based on other condition.

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