MDG-S (NWBC) Web Dynpro application BS_OVP_BP does not exist


I am trying to have access to MDG-S but unfortunatelly I have the following error message : Web Dynpro application BS_OVP_BP

I use  ECC 6 system EHP5. I did not made changes on the data model.

My first objective is just to have access to the application through the NWBC.

My problem seems that the services BS_OVP_BP is not activated

Can you help me to solve this issue ?

Thanks in advance