Invoice Approval Rule for PO with Agreement

Summary:

Invoice Approval Rule for PO with Agreement

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We would like to configure Invoice Approval based on different PO's. Some of the PO's are created by submitting requisition. Some of the POs created with reference to PO agreement. Can we create invoice approval rule to route the invoices which are matched to POs with reference to PO agreement to approvers? What are conditions should be used in the approval rule for PO agreement reference? Can we use PO Number prefix in invoice approval condition? or Can we use PO and Invoice distribution DFF mapping in approval condition?