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1. Click on the Configuration tab
2. Click on System options
3. Click on Income
4. Enter the number of days as a Transaction effective date limit (days), e.g. 30 days would allow users to backdate transactions up to 30 days ago, but no more.

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Note that you can set this value back to 0 days once the financial year end process is complete to prevent users backdating further transactions and changing data.

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