System dashboards should be restricted by Security Role in Dynamics 365 CRM

Hi All,

I'm facing an issue to assigning a Security Role to a System Dashboard.

Default Solution 

Component Type:  Dashboards

View:   All

Any System Dashboard.

After selecting the System Dashboard Click on "Enable Security Roles"

By default all Security Roles assigned to it, when i try to assign it Only System administrator i'm not able to Save it, please see attached.

i have already looked this Question, but not able to fix the issue.

https://community.dynamics.com/crm/f/microsoft-dynamics-crm-forum/242433/user-roles-based-restriction-required-to-access-system-dashboards-in-dynamics-365-crm/669153

is there any way to Assign it only System administrator Security Role?

Thanks

Regards 

Muhammad Bilal