"code": "DuplicateNexusError",
	"target": "Unknown",
	"details": [
			"code": "DuplicateNexusError",
			"number": 144,
			"message": "Cannot create duplicate nexus entries.",
			"description": "There is more than one nexus with the following information: CompanyId: -0-, Region: -1-, JurisCode: -2-, JurisTypeId: -3-, JurisName: -4-, NexusTypeId: -5-, NexusTaxTypeGroupId: -6-, EffectiveDate: -7-. Please try a different effective date for the record",
			"faultCode": "Client",
			"helpLink": "http://developer.avalara.com/avatax/errors/DuplicateNexusError",
			"severity": "Error"

AvaTax uses the name “Nexus” to refer to all jurisdictions where your company wants to collect and remit transactional taxes.

In the United States, the concept of “Nexus” indicates that your company is subject to the tax laws of a particular jurisdiction. Even though some locations worldwide may use a different term, the concept remains the same.

When declaring that you are subject to the tax laws of a particular jurisdiction, you can only declare that jurisdiction once. This error message occurs when you attempt to create a new Nexus declaration that conflicts with an existing declaration.