I'm here to make sure you'll be able to change the transaction type, @stsd.

Let me provide you a steps on how to do it:

1. Go to Banking menu then select Bank feeds.
2. On the Bank Feeds Center select your bank account.
3. Click  Transaction list, click on Added/Approved to view register.
4. Double click the transaction that has CHK type.
5. On the Bank Account drop down, select the account to transfer.

Let me include this article for future reference: Add and match Bank Feed transactions in QuickBooks Desktop.

Drop any addition concern on the comment, I'll be glad to help.