storing objects

Hi,

i am not shure, but is ist correct when i have an object, witch is a 
tree of some other objects (colletions) and i delete a part of the tree 
and then store the hole object (tree) - in the database the deleted 
object will also be deleted ?

Everything works fine, when i store or update the object, but not when i 
delete.
The deleted part of the object will not be deleted in the database. I 
can remove it by hand, when i run a remove.object  (the part of the 
tree) and then store the (changed) tree.

Is this normal ?


Hans