Resetting Check Numbers
By default, NetSuite sets the Check # field to the largest existing check number increased by one. If you have the appropriate permission, you can reset numbering to a lower or higher number than the current one.
To reset check numbering:
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Go to Lists > Accounting > Accounts, or Setup > Accounting > Chart of Accounts.
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In the list of accounts, click Edit next to the bank account where you want to reset check numbering.
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In the Next Check Number field, enter the check number for the next check from this account
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Click Save.
If your NetSuite account uses auto-generated check numbering, you can reset the initial numbering for the check transaction type. For information about auto-generated numbers, see Set Auto-Generated Numbers.