Avoiding Duplicate Transaction Numbers
NetSuite provides several methods you can use to avoid the entry of duplicate transaction numbers.
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Set a user-level preference to receive a warning when a duplicate transaction number is entered. Go to Home > Set Preferences. On the Transactions subtab, check the Duplicate Number Warnings box.
To access preferences, you need the View level of the Set Preferences permission.
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Set an account-level preference to receive a warning when a duplicate transaction number is entered. For information, see Duplicate Number Warnings.
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Use auto-generated numbering for transactions. For information, see Using Auto-Generated Numbering for Transactions.
If auto-generated numbering is enabled in a OneWorld account, subsidiary-specific prefixes for transaction numbers can be defined in subsidiary records. This ensures that each subsidiary's transactions has its own numbering sequence. See Using Subsidiary-Specific Transaction Auto-Numbering.