OverlappingFilingCalendar
Example
{
	"code": "OverlappingFilingCalendar",
	"target": "Unknown",
	"details": [
		{
			"code": "OverlappingFilingCalendar",
			"number": 903,
			"message": "Requested filing calendar overlaps with an active filing calendar",
			"description": "Filing Calendar -0- for -1- is active for the requested effective dates of the new filing calendar.  Please obsolete the current calendar before approving the new one.",
			"faultCode": "Client",
			"helpLink": "http://developer.avalara.com/avatax/errors/OverlappingFilingCalendar",
			"severity": "Error"
		}
	]
}
Explanation

This indicates that the requested filing calendar overlaps with an active filing calendar. A filing calendar cannot overlap with a conflicting filing calendar.