How to Make Supplier Field Mandatory on Process Requisitions Page?

Summary:

We need to make this supplier filed mandatory in the stage of Process Requisitions Page or in the Requisition page, as it per business process each requisition should be monitored before submitting it for approval or reprocessing the requisition to Purchase Order. At the stage of Process Requisitions Page, requisitions are blank and buyers need to enter supplir name or in the Process Requisitions Page or after processing it to PO which violates business process for supplier auditing.

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