Handling credit card payment for a linked account from a non-YNAB account
I've been using YNAB for over a year now but I'm stumped on how to handle an "outside" credit card payment. My wife paid off our credit card (linked in YNAB) from one of her business accounts, which is not a budget account and not linked in YNAB. The problem now is that I can't figure out how to deal with the transaction once it imports since it has no relation to any purchases/categories in YNAB and isn't seen as a payment/transfer from one YNAB account to another.
I've run manual transactions to test out how to handle it but no luck. YNAB will treat this $6k payment as a credit to the credit card account account, requiring a category to put this "new" money/deposit into. The problem is that while the credit card account balance might go back to $0, there are no negative categories for this payment to balance out back to $0. That's my problem. Without a negative -$6k category for the positive $6k payment to balance out against, YNAB treats the balance payoff as new money to be budgeted, which it isn't.
How do I deal with this?