SlabBaseQuantities - NetArea

The net area shows the surface area of the slab. It should be the gross area minus openings. The englisch description of this property does not explicitly state this, it seems clear that it should be related to gross area. The german description is less ambiguous: "Fläche der Decke (Ansichtsfläche, nicht projizierte oder Mantelfläche). Alle Öffnungen werden abgezogen. Der Wert wird nur angegeben, wenn die Decke eine kostante Dicke hat."

Greetings,
Thomas

Start at the SlabBaseQuantities.NetArea entry point and compare the English and German property descriptions. Trace how the slab surface area is determined, checking that openings are excluded and that the constant-thickness condition is respected. Done means the exported net area and its English description match the stated German semantics.

Written by the indexing model from the issue text.