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Thanks for your help. Your suggestions have been very useful.
I have managed however to solve the problem (actually go around it) with the following code:

In the repeatedly_execute function I put:

if (mouse.y>184) {                        // this checks if the cursor is over the inventory GUI
 
   if (GetGlobalInt(499)==0) { // this ensures that the mode change happens only once
       SetGlobalInt (499, 1);
       SetCursorMode (MODE_USE);
       SetMouseCursor (6);
       }
 }

 if ((mouse.y<184) && (GetCursorMode()!=MODE_USEINV) && (GetGlobalInt(499)==1)) {      // this reverts the cursor back to walk mode after leaving the inventory unless an item is selected
 SetCursorMode (MODE_WALK);
 SetGlobalInt(499, 0);
 }

This goes in the on_mouse_click function:

   if (button == RIGHTINV) {
     RunInventoryInteraction (game.inv_activated, MODE_LOOK);
     }


The script works fine, but the "Handle inventory clicks in script" must NOT be ticked.
I know this solution is a bit akward but it works.

I wait for your opinions.

  I am designing an inventory GUI that is constantly visible on the bottom of the screen (resembling the one from "The Uncertainty Machine" [great game]).
 I tick "handle inventory clicks in script" and I use to following code in on_mouse_click function :

   if (button == LEFTINV) {
     RunInventoryInteraction (game.inv_activated, MODE_USE);
     }
   if (button == RIGHTINV) {
     RunInventoryInteraction (game.inv_activated, MODE_LOOK);
     }

The RIGHTINV part works normally, but I cannot make the cursor pick up the item with the LEFTINV.
I actually take no responce.
Putting MODE_USEINV instead of MODE_USE only interacts with the item and doesn't pick it up.

Any suggestions? I'm a begginer.

Thanks