Code to demonstrate opening the classification dialog in Aras Innovator 11.0

Test Open Classification.js

// Trying to open the classification dialog programmatically
var ourItemTypeName = "Part"; // <-- Change this to your ItemType name
var ourItemType = top.aras.getItemTypeForClient(ourItemTypeName, "name");

var param = {
    aras: top.aras,
    isEditMode: true,
    itemTypeName: ourItemTypeName,
    class_structure: ourItemType.getProperty("class_structure"),
    dialogType: 'classification',
    selectLeafOnly: true,
    isRootClassSelectForbidden: true,
    resizable: true
};

var options = {
    dialogHeight: 500,
    dialogWidth: 350
};

// I'm not sure if "DefaultPopup" is supported in 11.0, so you can also try "DefaultModal"
aras.modalDialogHelper.show("DefaultPopup", top, param, options, "ClassStructureDialog.html");