InvalidEcmsOverrideCode
Example
{
	"code": "InvalidEcmsOverrideCode",
	"target": "Unknown",
	"details": [
		{
			"code": "InvalidEcmsOverrideCode",
			"number": 171,
			"message": "EcmsOverrideCode is invalid.",
			"description": "EcmsOverrideCode is conflicting with existing EntityUseCode.",
			"faultCode": "Client",
			"helpLink": "http://developer.avalara.com/avatax/errors/InvalidEcmsOverrideCode",
			"severity": "Error"
		}
	]
}
Explanation

This indicates that the code you supplied conflicts with an existing EntityUseCode. For a list of system-defined EntityUseCode values, see ListEntityUseCodes. Review this list and try again with another EntityUseCode.