I can share some information about this Bill.com concern, @jack78,
In QuickBooks, we do not automatically void transactions. Instead, all actions related to existing entries are to be done manually, like, editing, deleting or voiding. This is because we want to make sure your books and financial report data isn't altered erroneously.
However, in Bill.com, check payments that are not cashed within 90 days will auto-void. You will see this information under Void check service fees section of this article: Voiding bill payments and what to expect (Bill.com)
In relation to this, the article states that the void will sync back to your QuickBooks Online account, and no further action is needed. This is the reason why you're seeing the transactions being zeroed out.
If there are open bills, the bill will show as unpaid after the sync. Please note that Bill.com will not re-debit your account after the auto-void. If you don't need to pay the bill, you can either edit, delete or mark the bill as paid so it is not accidentally paid.
Use the same process of paying the bill to ensure your Accounts Payable balance is fixed.
Let me know if you have any other billing questions or need any help with the software. I'll be more than happy to help you. Have a good one!
