TaxCodesAreAllSame
Example
{
	"code": "TaxCodesAreAllSame",
	"target": "Unknown",
	"details": [
		{
			"code": "TaxCodesAreAllSame",
			"number": 2211,
			"message": "All tax codes for the documents are the same.",
			"description": "In order for the company to be certified, all the TaxCodes for documents cannot be the same, in the past month or among the last 100 documents.",
			"faultCode": "Client",
			"helpLink": "http://developer.avalara.com/avatax/errors/TaxCodesAreAllSame",
			"severity": "Error"
		}
	]
}
Explanation

This error indicates that all of the tax codes for the document are the same. For company certification, recent documents cannot have the same tax codes. Recent documents include those from the past month or the last 100 documents. Update your tax codes where applicable.