Purchase order &1 does not exist for invoice &2

What causes this issue?

Your selection included invoice &V2& which refers to purchase order &V1&
. This purchase order does not exist in the system. It may have been
reorganized.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

How you now proceed depends on whether you entered the invoice in
Logistics Invoice Verification or in the conventional Invoice
verification component.
Logistics Invoice Verification:
Display document &V2& in Logistics Invoice Verification and find the FI
document via <LS>Follow-on documents</>.
<DS:TRAN.MIR4>Display Invoice Document</>
Change the accounting document: Delete the entry <LB>R</> in the
<LS>Payment block</> field in the supplier line.
<DS:TRAN.FB02>Change document</>
Conventional invoice verification:
Change document &V2&: Delete the entry <LB>R</> in the <LS>Payment
block</> field in the supplier line.
<DS:TRAN.FB02>Change document</>
Save and call up the Release invoices transaction again.

Error message extract from SAP system. Copyright SAP SE.