I wrote a check that did not appear on the check register. The coded expense items were on the income statement but the check was not deducted from cash.
If you did use the Write Check function and you know the check exists, open Write Check and lower left of header click Find
Now enter just one detail such as check number, amount, payee. You only need one to search. This will pull up all checks matching your search criteria. Click on the one you want. Edit the bank account check was written from as it sounds like that is your error.