No body set in N1N2TransferFailureNotification message

type N1N2MsgTxfrFailureNotification struct {
Cause N1N2MessageTransferCause `json:"cause"`
N1n2MsgDataUri string `json:"n1n2MsgDataUri"`
}
==>api_n1_n2_message_transfer_status_notification_callback_document.go
func (a *N1N2MessageTransferStatusNotificationCallbackDocumentApiService) N1N2TransferFailureNotification(ctx context.Context, n1N2MessageTransferNotificationUrl string, request models.N1N2MsgTxfrFailureNotification) (*http.Response, error)
Above function has been used to send FailureNotification by AMF. In this function, RequestBody is not set (or) request param is not used to set it as body in the function definition. Hence AMF is not sending N1N2TransferFailureNotification with Body to SMF.
Please help me how to fix this issue?