Hello, I have a problem when I try to save my RFLP models with a FMU connected to something else.

Some inputs of the FMU (on the right) are connected to the Dymola behaviors on the left. When a logical connection between one of the real input or output of the FMU and another interface, the logical connections have 'Real' in it's name. 

When I try to save, I have this error :

The saving problem comes from the 'Real' thing :

I can ignore the saving error but none of the logical connections will be saved

Can someone explain why this happens ?

Edu ​​​​​​​3DEXPERIENCE ​​​​​​​Dymola ​​​​​​​Behavior Modeling ​​​​​​​Systems Engineering ​​​​​​​