App will not reconcile invoices. 4 paid from same customer. Match them all leaving 0.00 only for the app to say it can't do it as the result must leave 0.?

I can assist with your invoice concern, uktransport.

Currently, we've received similar cases or reports about the issue. I recommend contacting our QuickBooks Support Team to be added to the affected users list, ensuring you receive email updates on the investigation's status and resolution. Please include investigation number INV-100590 for expedited processing.

Here's how. 

1. Go to the (?) Help icon.
2. Select Talk to a Human.
3. Enter a short description of your concern.
4. Click on I still need a human.
5. Tap Contact Us to connect with our live support.
6. Choose to Get a callback.

In the meantime, you may want to sign in to your QuickBooks account in a web browser to match your transactions.

Additionally, you can refer to this link to learn more about customer payments: Handle a customer credit or overpayment.

You might find the following articles helpful about adding and matching transactions in QBO: 

• Download, match, and categorise your bank transactions
• Reconcile an account

Please don't hesitate to let me know if you have other concerns about managing invoices and payments in QuickBooks. You can drop a comment below, and I'll gladly help.