going from a scrollable position to a nonscrollable position?

Ran into a little problem today, i want to spawn an item into a scrollable layer and then have that item interpolate to a nonscrollable layer(the HUD). Im making an rpg and when the player collects a resource, I want to spawn the item from the node(scrollable layer) and interpolate its position to your inventory which is a nonscrollable layer. the problem is the grid coordinates (350,820) mean something different to the nonscrollable layer than to the scrollable layer..
Any help would be greatly appreciated!