how to undo voided check?

We have an unusual scenario where the user acidently voided a check which was issued and cashed more than a month back. But now the check is voided in the system and the corresponding GL transactions (Create Accounting and Transfer to GL) completed. The problem is that now the vendor shows an outstanding amount to the amount on the voided check.

In most of the articles I read it says that voids cannot be undone and should be done only if you are in possession of the check. Is there any data-fix which could help reversing this scenario or is there any other way anyone could suggest that I should go about to find a solution.