It can happen to anyone: You forget your business debit card and, for convenience, make a payment using your personal account.
Here’s how you should process this in your bookkeeping:
Process via Bank/Cash
If a payment is made using your personal account, your business owes that amount to your personal account. In this case, you should transfer the paid amount from your business account to your personal account. Once this has been done, you can find the transaction via Bank/Cash and record it against account 655 - Private.
If you are an older customer, account 655 might be labeled as Private Withdrawal instead of Private. You can change this to Private, or you can create an additional general ledger account for Private Deposit.
Process via Manual Entry
If you choose not to transfer the amount from your business account to your personal account, the payment still needs to be recorded. After all, an invoice or receipt has been paid, but it hasn’t been processed in the system as such.
To register a personal payment, go to Advanced > Memoriaal > New. Find the paid invoice or receipt via the tabs and click on it. Then, choose "New line" and in the new line, select category 655 - Private. After saving the entry, the invoice will be marked as paid, but the bank balance will not be adjusted since you have registered that the payment was made from your personal account.