ReadOnly
Example
{
	"code": "ReadOnly",
	"target": "Unknown",
	"details": [
		{
			"code": "ReadOnly",
			"number": 25,
			"message": "-0- is read-only.",
			"description": "This API requires ownership of the -0- with -2- '-1-'.  You have read-only permissions for this object.",
			"faultCode": "Client",
			"helpLink": "http://developer.avalara.com/avatax/errors/ReadOnly",
			"severity": "Error"
		}
	]
}
Explanation

The field cannot be changed because it is read only. This ‘read only’ status may be due to the user’s role and the associated permissions.