how can I edit the name of supplier in the Purchase order?

To update the supplier name, open the PO and pick a new name from the Supplier dropdown. Once you've made the switch, save your changes.

If a PO is CLOSED because it's linked to a bill or expense, you'll need to reopen it to make changes. To do this, open the PO, switch the status under the Supplier field back to OPEN, make your edits, and click Save and close.

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