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Model coupling - linear extrusion, CFD

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Hi everybody!
I'm modeling a CFD - Problem in 3D. As described in the example "Turbulent backstep" I want to use the results of on model (velocity field of a turbulent flow) as an inlet for the next model.
So in the first model I use a quarter of the domain with symmetry on boundaries. I create model couplings with linear extrusion. I map the results 4 times to the second model without symmetry. The geometry is very simple for the moment, because I'm looking for my errors.
But it seems the velocity field is not defined in the second model, or better the operator linext1 is not well defined in the first model.
Can anybody see what I'm missing?

Thanks a lot.

--
Berta

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