Out of scope supplier invoice included in VAT return

Raised 2 invoices on a supplier marked as VAT exempt and then assigned 2 partial payments to them, the invoices have no VAT on them but one of them appears in the VAT return under prepayment and 20% of the prepayment shows as VAT. Changing the invoice from exempt to out of scope makes no difference to the VAT report.

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Sorted, the invoice date was incorrectly set to 2 oct, when I pushed it back to its proper date it dropped out of the VAT report (end date 30th Sept), still its odd that it showed up as that was the only change I made.

I ran this by a developer who informed that it was the invoice date that was causing that payment to show on the VAT return. As the out of scope invoice was not falling withing the filed period, that payment was just considered as a prepayment up until that point. Moving the OOS invoice into the period would indeed pull the payment out of the return.