We appreciate you posting your concern here in the QuickBooks Community, Amplfied.
Recording this repayment as personal income in QBO is not advisable. It would be best to consult your accountant to determine the appropriate category to record this transaction. Once you have spoken with your accountant, you can follow these steps to save the repayment:
Using Check:
Select +New, then Check.
Enter the person or business you're paying back.
For the Check no., enter a check number.
Enter the following information in the Category Details section.