Editing a Gift that was incorrectly posted as a Pledge payment

Hello everyone. I have read through a few strings here but have an issue that is not addressed. I am working in RE Database but would be happy to use RENXT if possible. My issue is that we had a donation that was posted in the wrong Gift subtype, Campaign, and Fund. It was also erroneously posted against an Pledge. I went into RE database, pulled up the Gift, and used Adjust to make the changes. When I went to uncheck the Pledge checkbox and tried to save the Adjustment, I got following error message:

• No installments are selected

So I worked through a few more attempts getting errors like:

• The total amount applied ($0.00) does not equal the payment amount ($200,000.00). Do you wish to update the payment amount to $0.00? (at first I panicked and bailed, then I tried again and hit “Yes” which gave me the following error message)
• The payment amount ($0.00) is less than the amount of the gift ($200,000) Do you wish to update the gift amount to $0? (at this point I realized I was in over my head so I am looking for some help).