Changing perspective, problem with items moving to the right on top of anothers

[scoterr]

Hello guys, I'm working on changing perspective in Tibia from that \ to |... Don't know how to describe it so I will post a screenshot:

And now the problem... When i put a chest on a table for example...

The chest or any other item is moved to the left... Is it possible to change the coordinates for item to go after putting it on something?
Or will it need to modify client source code?

Please answer...