Ok, once i have the problem with the SYSDUM.TXT, i making maps. I have one question. When i want to put an Item into a building with floors i don't know how Z i must set! How i can know exactly the Z so i can put items on the 1st and the 2nd floor etc 3...Because when i putting an item into the 1st floor is always wrong placed!
Here is an image with wrong items placed:

Also i don't know what is "Absolute Height" And "Lock".
Can anyone help me please?