Locking and Unlocking Accounting Periods
You can lock accounting periods or transaction modules for a period to prevent users from posting transactions that affect the general ledger. Locking is part of the period close process.
If you check the Enable Accounting Period Window accounting preference, you can also lock future periods to provide greater control for your accounting process. When this preference is checked, lock 
icons are displayed for future accounting periods. See Rules for Future Accounting Periods for information about how locking and unlocking periods performs with this preference.
To lock an accounting period:
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Go to Setup > Accounting > Manage GL > Manage Accounting Periods.
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Click the Checklist icon
for the period. -
Click the Go To Task icon for Lock All.
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If you are a NetSuite OneWorld user, select which parent or subsidiary to lock the accounting period for.
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On the Task: Lock Accounting Period (All) page, click Submit.
To lock a transaction module:
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Go to Setup > Accounting > Manage GL > Manage Accounting Periods.
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Click the Checklist icon
for the period. -
On the Period Close Checklist page, do one of the following:
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To lock A/R transactions in the period, click the Lock A/R icon, then click Lock.
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To lock A/P transactions in the period, click the Lock A/P icon, then click Lock.
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To lock Payroll transactions in the period, click the Lock Payroll icon, then click Lock.
Note:If you are a NetSuite OneWorld user, select which parent or subsidiary to lock the accounting period for before you click Lock.
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To unlock an accounting period, you must unlock each transaction module in the period.
To unlock an accounting period:
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Go to Setup > Accounting > Manage GL > Manage Accounting Periods.
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On the Manage Accounting Periods page, click the Checklist icon
for the period. -
On the Period Close Checklist page, click the Lock A/R icon, then click Unlock.
Repeat this step for Lock A/P, Lock Payroll, and Lock All tasks.
Note:If you are a NetSuite OneWorld user, select which parent or subsidiary to unlock the accounting period for before you click Unlock.
To unlock a transaction module:
For information about how to unlock a transaction module for a period, see Unlocking Period Transactions.
When you unlock a transaction module such as A/R Transactions, All GL Transactions is also unlocked.