I have found a bit of a workaround. From what it seems, this error seems to be triggered when copying a previous invoice. I've had the same issue where none of the fields were missing or incorrect, yet would still receive the "Some of the fields have invalid values. Please correct and try again.." error message. The best solution is to simply create a new invoice instead of copying a previous invoice, and see if that resolves the issue. 🙂
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