When an Overhang or Sidefin has been specified on a window in a given wall, it is a requirement that a complete set of inputs for the wall, and all surfaces in that wall (windows and doors) be provided.
Inputs needed for the walls, windows and doors include the Area of the surface and the Width and Height of the surface. The Width and Height must equal the Area of the surface.
In addition, each window and door must include an X and Y input describing the location of the bottom left corner of the surface relative to the bottom left corner of the wall as viewed from the outside.
Note that when describing the X and Y positions, it is important to ensure that no two surfaces on that wall overlap each other.
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