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How do I resolve the error System.JSONException: Unknown field: c2g.AvataxRestClient.TaxResponseDetail.JurisCode in Financial Force?


You are attempting to calculate tax but the transaction in Financial Force is not updating and the error "System.JSONException: Unknown field: c2g.AvataxRestClient.TaxResponseDetail.JurisCode" appears.


Financial Force


  • Please contact Financial Force technical support (, they need to make an update to your system.
  • There is a permanent fix in process: content coming soon!


Note: The Avalara service is functioning as expected, the issue is that the Financial Force system is not able to update the transaction with the tax as calculated.