Unable to select calender for project management implementation options

Summary

The project calender has been defined, but it is not possible to select this calender in the list of values during setup for project management implementation option

Content

I have defined the project calender, but when i try to assign it through the project management implementation options, I am not able to select any value. Also the calender for resources has no value.

Can you please help me how to solve this issue, because the user role is no generating an error message when i  click on project management.

Thanks for your help in advance.

 

Best regards,

Wim van der Veer