How to make the Rejection Reason field required when supplier rejects order in acknowledgment page?

Summary:

When an order's status is "Pending Supplier Acknowledgment," a supplier can either reject or accept the order via the Supplier Portal Suplier Acknowledgment page. If the supplier rejects the order, we would like them to provide a rejection reason under the Schedules. Currently, when the supplier rejects an order, providing a rejection reason is not mandatory.

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