Translations:Feature editing/64/en

Both sketches and datum planes should be attached to base planes. Referencing generated geometry (geometry that is the result of a feature creating operation, for example a pad or pocket) should be avoided since faces and edges get renamed and renumbered and the references no longer refer to the same thing. This is called topological instability and is due the way FreeCAD uses some external geometric libraries. Hopefully this will be improved in the future. (See Advice for creating stable models below).