Urgent help needed in Cube Security implementation

Question

I have a need in implementing security in one of the dimensions(Performance Rating) and users under different roles should be able to browse the cube as below.
The tables information is as below
Dimension Table
Description
Dim_Employee
Employee details-ID,Name,Gender,Age
Dim_PerformanceRating
Performance code,Descriptioin
Dim_Role_User
Role and users available under each role 
Fact Table
PerfID,EmplyeeiD,HeadCount as measure
If the User under HR Role browses the cube he should be able to view the details as below:
All Employee Details , counts but performance ratings to be restricted only for the employees under his (HR) role.
Dim-Employee
Dim-Employee
Dim_Perfrating
Dim_Role_user
Measure
Emp ID
Name
Perf Rating
Employee Type
Emp Count
1
A
VP
1
2
B
Other
1
3
C
SM
HR
1
4
D
VP
1
5
E
HR
1
6
F
HR
1
7
G
FE
HR
1
8
H
CE
HR
1
9
I
DNM
HR
1
10
J
NR
HR
1
If the VP  browses  the cube he should be able to view all the details as below
All Employee Details, counts and all the performance ratings of all the employees under him
Dim-Employee
Dim-Employee
Dim_Perfrating
Dim_Role_user
Measure
Emp #
Name
Perf Rating
Employee Type
Emp Count
1
A
SM
VP
1
2
B
FE
HR
1
3
C
SM
Other
1
4
D
CE
VP
1
5
E
SM
HR
1
6
F
SM
HR
1
7
G
FE
Other
1
8
H
CE
Other
1
9
I
DNM
Other
1
10
J
NR
Other
1

Answer 1

Hi,
You need to Implement a dynamic security. Implement a factless fact table which includes information which user is allowed to see which nodes. Create a Measuregroup for this Table "FactSecurity"
Create a UserDimension which includes Domain\Usernames.
Map the User Dimension and the Perfrating Dimension to the FactSecurity Measuregroup
In the Role implement the security like this:
EXISTS([Dim_Perfrating].[PerformanceCode].[PerformanceCode].Members, STRTOMEMBER("[Users].[DOMAIN].["+UserName+"]"), "FactSecurity")
If needed check Visual Totals.
Kr Jü+rgen