Arch: Fixed bug that builds a structure on top of another structure

src/Mod/Arch/ArchStructure.py

@@ -352,6 +352,7 @@ class _CommandStructure:
         self.continueCmd = False
         sel = FreeCADGui.Selection.getSelection()
         if sel:
+            if Draft.getType(sel[0]) != "Structure":
                 # direct creation
                 FreeCAD.ActiveDocument.openTransaction(str(translate("Arch","Create Structure")))
                 FreeCADGui.doCommand("import Arch")
@@ -366,7 +367,8 @@ class _CommandStructure:
                         FreeCADGui.doCommand("Arch.makeStructure(FreeCAD.ActiveDocument." + obj.Name + ")")
                 FreeCAD.ActiveDocument.commitTransaction()
                 FreeCAD.ActiveDocument.recompute()
-        else:
+                return
+
         # interactive mode
         if hasattr(FreeCAD,"DraftWorkingPlane"):
             FreeCAD.DraftWorkingPlane.setup()