GR/IR account balance is not Zero in PO history

Hello Experts

I have this scenario where we have entered the invoice before Gr hence the Po value has changed and then when reversed it has different value there after we entered the correct value however the GR/IR balance in PO history still show here. So in short we messed up

We knew what happended and triggered this.

My question how do we clear this now since the posting period is in past and its closed. particularly when we reversed Goods reciept it reversed with amount 3494.76 instead of 6451.10? how do we balance this?

so how do we correct thsi to make it zero?

Any help will be apriciated SAP MM

Thanks

Prasad.