Yes, I used a QB "Bank" account type to track my AMEX for many years. I recently noticed that there is a "Credit Card" account type, so I switched the type so that the account shows up correctly as a liability on my balance sheet. I am a good number of transactions in now as the "Credit Card" type and when I tried to open an older check transaction, I received this error. The only way to get out of the loop is to select "Create a Copy", and then "Clear". With that said, it would be exceedingly helpful for QB to have a way to convert the older check transactions to work within the "Credit Card" account type framework. Is this possible?