"code": "LineNoOutOfRange",
	"target": "Unknown",
	"details": [
			"code": "LineNoOutOfRange",
			"number": 707,
			"message": "The specified line -0- for refund is out of range.",
			"description": "The Specified line does not exist in original transaction.",
			"faultCode": "Client",
			"helpLink": "",
			"severity": "Error"

The Refund API can only create a refund for line items that existed in the original transaction. If you call the Refund API, and specify a line number that does not exist on the original transaction, you will get this error message.

To avoid this problem, you may want to consider calling the Refund API with a type of Full, which will cause the entire transaction to be refunded.