Let's work hand in hand to organize your account, lauriesiegmund.
You can follow the procedure by my peer above on how to re-categorize the transaction. However, you've mentioned that your account has been reconciled, with that said as John-Pero mention, nothing you can modify in a reconciled transaction other than the date or amount will take effect in the status. You could change the "paid to" or expense category from with no effect.
Here's an article you can check for further information about the categorizing transaction in QuickBooks:
If you have other questions or need further assistance, let me know in the comment. I'll be more than happy to help. Have a wonderful day!
