Thanks for joining us here on the community. What happens when you attempt to void the invoice? Was this bad debt? Are you cash or accrual for your VAT?
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You shouldn't really be voiding old invoices - particularly ones that have been Filed for VAT.
IMHO, the Void option shouldn't be so easy to access. It creates more problems that it solves.
Much better to raise a Credit Note & use that to 'pay off' the Invoice.
Alternatively, if marking as Bad Debt, create a Bad Debt journal & use that to 'pay off' the Invoice.
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