Wrongly tagged invoices embargoed by VAT return, can they be changed?

Hi, I have trouble with one supplier who routinely doesn’t send remittances, so occasionally I need to second guess which invoices have been paid. A few months ago I tagged two in particular which now turn out to be incorrect- there was coincidentally one invoice for the same amount from the same supplier at a similar time.
It doesn’t seem to be possible to detag an embargoed VAT return, or is it? Can anyone help as I can’t find the answer on any forum.

Are you on cash or accrual basis for vat?

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