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How can I update the tax class on open invoices in Sage 300?


You are getting an error when processing a batch "It is required to set Registration Number to Exempted Tax Class for making transaction exempted, cannot proceed with AvaTax." and you want to know how to mass update the invoices to tax class 1.


Sage 300



  • Change the tax class to 1:
    • Manually update the tax class on each invoice or 
    • Execute a SQL statement on the affected tables in the Sage database