NexusChildDateMismatch
Example
{
	"code": "NexusChildDateMismatch",
	"target": "Unknown",
	"details": [
		{
			"code": "NexusChildDateMismatch",
			"number": 1501,
			"message": "To change nexus declarations for a state or country, you must ensure that all city or local nexus declarations are within range.",
			"description": "Please ensure that the dates for your nexus declaration for the Country: -0-, Region: -1- match with all local jurisdictions within that state or country.  This error occurs when you have a local nexus whose dates fall outside of the boundary EffectiveDate: -8-, EndDate: -9-.",
			"faultCode": "Client",
			"helpLink": "http://developer.avalara.com/avatax/errors/NexusChildDateMismatch",
			"severity": "Error"
		}
	]
}
Explanation

This indicates that the nexus out of date range with its children. Review the error message and description for specific information.