class MessageHolder:
    def __init__(self, target_x=0, x=0, target_y=0, y=0, target_z=0, z=0):
        self.target_x = target_x
        self.x = x
        self.target_y = target_y
        self.y = y
        self.target_z = target_z
        self.z = z

#this part is not working at all
@vehicle.on_message('POSITION_TARGET_LOCAL_NED')
def listener_position_target_local_ned(self, name, message):
    message_holder.target_x = message.x
    message_holder.target_y = message.y
    message_holder.target_z = message.z

#this part works great
@vehicle.on_message('LOCAL_POSITION_NED')
def listener_local_position_ned(self, name, message):
    message_holder.x = message.x
    message_holder.y = message.y
    message_holder.z = message.z