def METHOD_NAME(self):
    """
    Retrieves 1-based relative physical position in parent device. If the agent cannot determine the parent-relative position
    for some reason, or if the associated value of entPhysicalContainedIn is '0', then the value '-1' is returned
    Returns:
        integer: The 1-based relative physical position in parent device or -1 if cannot determine the position
    """
    return self.index+1