title: can't override class file in module in prestashop
body: <p>I want to override class(Product.php) file using my module. If i put it in root/override/classes/Product.php then it is working.</p>
  
  <p>But I want to put it in modules/my_module/override/classes/Product.php</p>
  
  <p>Then it is not working for me.</p>
  
  <p>If anyone done something like this then please let me know how can I do that ?</p>
  
  <p>Thanks.</p>