Operate many times, but only the first takes effect

Suite and Optimus Suite 5
#1

I use dataProcessor with dhtmlxTree. When I edit one node, the database updates. But when I edit some nodes, only the first I edited submit to the database and the others don’t. Why? Code is like:

    .....
    // w1 is a dhtmlxWindow
    var toolbar = w1.attachToolbar();
    toolbar.setIconsPath("./public/images/dhtmlxToolbarImgs/");
    ....
    authGroupTree = w1.attachTree();
     authGroupTree.setImagePath("./public/controls/dhtmlx/dhtmlxTree/codebase/imgs/csh_bluebooks/");
    authGroupTree.setSkin(dhtmlx.skin);
    authGroupTree.enableItemEditor(true);
    var myDP = new dataProcessor("authGroupAction!hotelGroup.action");
    myDP.init(authGroupTree);
#2

Please double-check the server side response, it must be an XML in the incorrect format.
If response is invalid - it may break the data saving for next items.

#3

Yes. I add the response header, and It works.