CannotDeleteParentBeforeChildNexus
Example
{
	"code": "CannotDeleteParentBeforeChildNexus",
	"target": "Unknown",
	"details": [
		{
			"code": "CannotDeleteParentBeforeChildNexus",
			"number": 1500,
			"message": "The nexus can't be deleted because child nexus exists.",
			"description": "You cannot delete or end-date your nexus for -0- because you currently have declared nexus in -1- -2- jurisdictions in -0-. Please delete or end-date those nexus first before changing the -0- nexus.",
			"faultCode": "Client",
			"helpLink": "http://developer.avalara.com/avatax/errors/CannotDeleteParentBeforeChildNexus",
			"severity": "Error"
		}
	]
}
Explanation

The nexus cannot be deleted due to child nexus tied to it. Nexus must be deleted from the child(s) up to the parent if there are child(s) nexus.