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Hi Eoin,
Ok there is no easy answer to this. If the invoice had have been marked as paid in a paid tax period that physically hadn’t been paid. You could have marked the tax period as unpaid, edited the invoice and marked as paid again as Bullet would recalculate your tax return.
But, now that the invoice was part of that tax calculation you’ll need to manually readjust the Bullet and also adjust your tax return. 
You can adjust Bullet using our manual journal entries feature. You’ll have to work out the differences in tax liability and submit that to the revenue outside of Bullet. 
If you’re not familiar with the journal entry accounting it’s best to get an accountant to do it for you Eoin. 
Hope that helps
Pete