Procure to Pay in Foreign currency

Hi

I have a foreign currency PO was raised at 1.30328. When doing  invoice matching with this PO  one month later, the invoice exchange was 1.30932.

As a result, there was a MAX Hold on this invocie.

My questions are

1. Does the user have to always release this hold manually ? As there is a time lage between riase of the PO and the invoice payment, the rate will always be a difference.

2. Is there a configuration set up can be done so that such invoice will not be a hold ?

Thanks for anyone able to answer my query .