How to see "Ref" in GUI? (/src/dialogs/item-properties.cpp:317)

As I understand from sources I should see it opening properties of clonned object. But I always see Id/Label/Description/etc whether I select cloned or not clonned object or object's clone.

sp_item_widget_setup ( SPWidget *spw, Inkscape::Selection *selection ) ... if (SP_OBJECT_IS_CLONED (item)) { /* ID */ ... gtk_label_set_text (GTK_LABEL (w), _("Ref")); ... /* Label */ ... gtk_label_set_text (GTK_LABEL (w), _("Ref")); } else { ... /* ID */ ... gtk_label_set_markup_with_mnemonic (GTK_LABEL (w), _("_Id")); ... /* Label */ ... /* Title */ ... /* Description */ etc