When you receive a purchase order, you can flip it into an ASN and send it to your customer by clicking on the Flip to ASN () icon for it in the Purchase Orders table. See View and Manage POs for more info. https://coupadev.atlassian.net/browse/CD-85992
To edit a draft ASN or update one in pending receipt status, click on the Edit () icon for it in the Advance Ship Notices table.
On the Create Advance Ship Notice page, fill in at least the mandatory fields (marked with a red asterisk).
Click on the Submit button to send the ASN to your customer, or on the Update button if you are sending an updated ASN.
When you send an ASN to a customer, the PO status changes to Issued even if you haven't sent the customer an invoice yet.