I can'^t move object in seceted axis

Hi guys, I've written a code piece, It Works actually but it isn't Works as i wanted.

 ///////////////////////////////////////////////////////////////////////////////
 //This script is written by Alp Giray Savrum
 //    SmoothMoveToMousePoint.js ; 10 March 2015, Monday 21.29
 ///////////////////////////////////////////////////////////////////////////////
 
 //Smooth Multiplier which is like SmoothFollow.js
 var smoothMultiplier : float;
 //Hit distance determines, where will our ray is going to stop ("Z" axis for directly forward),
 var hitDistance : int;
 //Our clicked target position holder. Also works for observation purposes.
 var clickedTargetPosition:Vector3;
 //Our real target position holder. Works for observation purposes too.
 var targetPosition : Vector3;
 
 //Is object going to be move in "x" axis ?
 var xAxis = false ;
 //Or will it move in "y" axis ?
 var yAxis = false;
 
 //Update function.
 function Update () {
 
     //Check for is player clicking left mouse ? (Default Mouse0 is Left, also works for touch at mobile devices)
     /*    GetKey, instead of GetKeyDown works for continuous input.    */
     if(Input.GetKey(KeyCode.Mouse0))
     {
         //Create a ray variable from camera point to screen click point (universe).
         var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
         //Get clicked position's universal positions.        
         clickedTargetPosition = ray.GetPoint(hitDistance);
         
             //If object will move in "x" axis...
             if(xAxis) {
                 //Change only "x" axis.
                 targetPosition.x = clickedTargetPosition.x;
             }    
             
             //If object will move in "y" axis...
             if(yAxis) {
                 //Change only "y" axis.
                 targetPosition.y = clickedTargetPosition.y;
             }
     }
         //Change position smoothly to targetPosition.
         transform.position = Vector3.Lerp (transform.position, targetPosition, Time.deltaTime * smoothMultiplier);
 
 }

At this code, I've programmed object to move in x axis when i click. It runs nice but, when i start to move camera (Parent object, has it's own movement script) object stucks at it's default place. I don't know why.