Initially, the Purchase Order is created in SAP and synced to the portal for the respective vendors.

After successful Login as Vendor and Purchase Order record will be shown in the Inbox. To Accept the PO click on the PO number.

After Verify all the details click on the Take Action button a popup will open. .

Based on the criteria select the radio button and click on the OK button. Accepted Purchase Order will be shown in the List of Purchase order page.