When a Purchase Order is cancelled, the related Requisition is automatically reverted to Open status, allowing the user to reprocess the bidding and create a new Purchase Order.

​@rasyllamanilao77 Customization required for this.

1. When the user selects Cancel Order on the Purchase Order, check whether the PO originated from a Purchase Requisition.
2. If there are no receipts or other downstream transactions against the PO, cancel the PO normally.
3. Update/reopen the related requisition so that it can return to the appropriate stage, most likely Pending Bidding or Open, depending on whether the vendor selection should be retained.
4. Reset the appropriate requisition/bidding quantities and vendor-selection information so the user can perform bidding again.
5. Keep the canceled PO in the system for audit/history purposes rather than deleting it.
6. Allow the user to complete bidding and create a new PO with a new PO number.

This would preserve the PO numbering sequence and provide much better document history. Standard Acumatica supports creating orders from a requisition when the requisition is in the Open status and uses Pending Bidding when vendor selection still needs to be perform