How to run a simulink model with a "co-simulation" fmu and bus signals?

Hello together,

i want to handle some bus signals with an imported FMU.

The picture below shows the desired functional struturce of the model. The model has a Co-Simulation module.

The FMU-block:

The FMU works itself fine without any interruption or warnings. The Matlab-function block only do some basic calculations and all in- and outputs are from data type double.

But when i simulate the parent simulink model, which includes the fmu block, i receive the following error messsage:

An error occurred while running the simulation and the simulation was terminated

Caused by:

• Error in supplied FMU: An error occurred in function 'fmi2ExitInitializationMode' for block 'FMU_Testmodell/FMU' during simulation. To debug your FMU file, select the "Enable FMU Debug Logging" check box. For more information, see the FMU troubleshooting documentation.

I used the debugger, but it shows me only the same error message again.

MathWorks only shows an example of a simulink model which use bus signals and a "Model-Exchange" FMU.

So i am asking me, if it´s even possible to run a simulation with bus signals and a co-simulation module?

When yes, why does this error appear?

Does anyone have a solution for this problem?

Or is it also possible to export a model-exchange fmu with matlab?

Thanks and kind regard

Tobias