Shading impact on daylighting

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Hi,

I try to determine the impact on shading transparancy on daylighting. I made a quick model to do my tests. It's a single space with one window (North orientation), wich is shaded:

I have a Illuminance Map and a daylight sensor in my space. On the documentation of shading surfaces (here), I see that for the daylighting calculation, the shading surface’s visible transmittance is assumed to be the same as its solar transmittance.

But, That's not what I observe in my tests. See below. In blue and orange, the Mean Illuminance Map and Daylight Sensor Illuminance for my test-case without any shading. In all the others colors, the same results, but for my test-case with shading, with a transmittance schedule of 0, 0.5 and 1.0. It seems like wathever the transmittance schedule is, the result is allways the same, like if the shading was completly opaque.

I assume I do something wrong, but I don't know what. Somebody can help me with this? Thanks!

I'm usign OpenStudio 2.9.1. The solar Distribution is FullInteriorAndExteriorWithReflectance.