QB Issue Resolution:
Amount is calculated as Units (quantity) times Rate. You have qty = 0.
And this never takes into account prior amounts Paid. That “prior” is amounts Previously Charged. This new sale has no concept of that prior sale being Paid or not; this just confirms there is an earlier charge out there, for the prior amount, qty and/or %.
It would be to your benefit to Customize your Progress Template. Hide Qty, if you are not using that, show yourself qty and/or %, where it matters to you and matters to the customer.
Behind the scenes, if you don’t use it, qty should still show and would be 1.
Resolution for Issue 'Unable to change the incorrect amount due on the QuickBooks invoice.' available: Yes (Solved).
Source: Intuit Community forum.
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