Closing VAT Periods
If you want to stop users from posting into a VAT period relating to a closed period, you can restrict this, even if the VAT return has not yet been submitted.
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Go to the VAT Ledger through Masters > Ledgers > VAT ledger >Accounts.
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Choose the relevant VAT period you are closing and raise the 'Access' to '9' and deselect the Input Allowed.