Construction: Airboundary for Window Material

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I am trying to model a room which is divided into two zones. I modelled the interzone surface as an opaque surface (windowframe) and placed a verry large fenestration surface (window) inside of the interzone opaque surface. When I tried to assign the AirBoundary construction to that interzone fenestration surface, the following errors occured:

* Severe * FenestrationSurface:Detailed="INSIDEWINDOW_ZONE1" has an opaque surface construction; it should have a window construction.
* Severe * FenestrationSurface:Detailed="INSIDEWINDOW_ZONE2" has an opaque surface construction; it should have a window construction.

The Aircoundary was constructed using the following setting:

Construction:AirBoundary,
Airboundary,             !- Name
InteriorWindow,          !- Solar and Daylighting Method
GroupedZones,            !- Radiant Exchange Method
SimpleMixing,            !- Air Exchange Method
10,                      !- Simple Mixing Air Changes per Hour {1/hr}     ;

According to the input/ouput reference of EP9.3: "Construction:AirBoundary indicates an open boundary between two zones. It may be used for base surfaces and fenestration surfaces." In this case, how can I assign an airboundary construction to the interzone window?

Thank you!