Element ID is just based off what you last had there.
Let's say I place a sink and name the ID 'sink-01' it will start numbering from there, but if I change the sink object to a car object, the ID won't change.
If I make a new object and place it, it is just using whatever you had there for ID of the previous object you were placing.
If you want to automate the ID field a bit, you can make favourites of objects you use a lot, or a legend of sorts with a lot of objects readily placed with the element ID set up the way you like.
Erwin Edel, Project Lead, Leloup Architecten
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