if change == nil {
		return errSRInvalidRequest(errInvalidArgument)
	}
	switch {
	case change.Create != nil:
		var sp *policy.Policy
		var err error
		if len(change.Create.SessionPolicy) > 0 {
			sp, err = policy.ParseConfig(bytes.NewReader(change.Create.SessionPolicy))
			if err != nil {
				return wrapSRErr(err)
			}
		}