POR that is stuck in Released but I can't process because the Project Task was changed on PO

I have a receipt that has been released and I can’t attach it to an AP bill because when I do, and then try to complete the process for the AP bill, it tells me that the Project Task was changed between the PO and POR and now I can’t process. I also can’t return the POR because I can’t change the Project Task. I created a dummy PO and POR so I could pay the bill, but now I have that POR “stuck”. Can I override it someway to mark it complete so it goes away? Please help!