You can easily track the status of your POs on the Purchase Orders dashboard. When adding/updating your PO, you can input its effective and expiration periods. Your PO is Active during this time period and is used for matching with invoices. Once your PO is past its expiration date, it’s status is automatically updated to Expired and it is no longer used for your invoices.
If you want to pause using an Active PO for your invoices, you can update its status to Suspended at any time by choosing Change status from your Purchase Order Details page. Suspended POs are not used for invoice association. You can change the status back to Active at any time to activate the PO for invoicing. This feature is helpful if you want to use a one-time PO for a specific purchase. You can do so by adding your one-time PO and suspending your other active POs. Once your purchase is complete and invoice is generated with your one-time PO, you can again activate your other POs, and suspend (or delete) the one-time PO.