Accepting Customer Purchase Orders User Guide
After you create a Customer Purchase Order, the status of PO and its line items changes to "Draft."
Order Management for Salesforce
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After you create a Customer Purchase Order, the status of PO and its line items changes to "Draft."
The Accept button is only enabled when the PO is in "Draft," "In Amendment," or "Pending Cancellation" status and at least one line item has been added.