can the system indirect edit the header field balance become 0? then in few months, the system indirect edit again the balance become 270 for example

Hi, @accounting179. The system won't just make changes to transactions recorded in QuickBooks.

You can check the Sales transactions menu for available credits, as this may explain why your balance is 0.

To check, go to the All apps menu and hover your mouse over Sales & Get Paid. Click Sales transactions.

You can also review the Audit log to see if your user has made any edits to your invoices. Don't forget to filter the date changed in the Audit log.

For additional assistance, please feel free to contact our customer support team by phone, as they have the right tools to help you check this matter.

If you need further assistance, please comment below, and I’ll help you right away.