In transaction CKMLQS there is a button "EXAPAND SUBTREE" but it does not work correctly. It opens only the first level. If the material has more than one level, you must open manually clicking on each of the sublevels.
After manually opened the sublevels, the button "EXPAND TREE" goes to work but then it is too late because the work is already done.
Has anyone noticed this problem? It's a bug in SAP?