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You can make changes to most sales (invoices, quotes and orders) in a few quick steps...except for these:
sales recorded in a closed financial year. There might be times when you need to enter adjustments for the last financial year. If you've already closed that year, you can still make changes by rolling back the financial year.
sales recorded in a locked period. To change a sale in a locked period, you first need to unlock the period. However, before making a change, consider how it will affect your accounts and tax reports (such as the GST you have reported).
If a sale transaction has a white zoom arrow next to it, it means it can't be changed. To make it changeable (so it has a blue zoom arrow ), set the following security preference. If your user role allows you to change preferences, you can change this option at any time.
Go to the Setup menu and choose Preferences.
Click the Security tab.
Deselect the option Transactions CAN'T be Changed; They Must be reversed.