DuplicateCompanyCode
Example
{
	"code": "DuplicateCompanyCode",
	"target": "Unknown",
	"details": [
		{
			"code": "DuplicateCompanyCode",
			"number": 142,
			"message": "The company code '-0-' has already been defined.",
			"description": "Please select a different company code.",
			"faultCode": "Client",
			"helpLink": "http://developer.avalara.com/avatax/errors/DuplicateCompanyCode",
			"severity": "Error"
		}
	]
}
Explanation

In AvaTax, each company you create needs a unique code that distinguishes it from other companies. You will receive this error if you attempt to create two companies with the same code.