Additional administrator with permission to Add,Delete and View AdminCP Whitelist is unable to do any of these actions with the following error:
You don't have permission to perform this action.
This is a bug #SVM-1738 which is planned to be fixed in future SolusVM updates.
As a workaround,
- Login to SolusVM admin panel.
- Enable "Add" and "Add Admin ACL" at Configuration > Administrator ACL > Edit ACL: