Negative Invoice in A/P

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I have a problem that there is a negative invoice showing up in my open invoice report, but this invoice does not show up in an other report i run. Going back through the vendor transaction history it seems that the invoice had a credit memo applied to it that brought it into the negative. Is there anyway to clear out this negative invoice?

I tried going into debit memos and applying it but that invoice is not able to be selected.