IIF condition mdx logic in Dimension security

Question

Hi,
I have Organization dimension which has multiple attributes like  District , Region, Corporate.
I want to show all date for Corporate users, region users to see only their region data and district users to see only their district data.
Users can be either Corporate , Regional or District user. Only one of these attributes will be True.
I have to implement this logic in dimension security of Organization dimension under advanced tab using IIF conditions. I am getting confused , can some one help
Logic will be -
For Current Logged In User - Check if Corporate Flag is set    
*True - Show all Organization Members    
*False - Check if Region No is set     
 *True - Show Organization with Region number equal to current user Region number    
  *False - Check if District No is set             
    *True - Show Organization with District number equal to current user Distric number               *False - Show all Organization members (mostly ESTAT case)

Answer 1

1. If the MDX query worked, I would assume that you have a valid member expression in the "Region Number" property. It should be something like [Region].[Region Number].[Reg1]. If you just have "Reg1" in the property, you will have to change the MDX like
below:
strtoset( "{" + "[Region].[Region Number].[" +
strtoMember("[User].[Login Id].[smv123]").Properties( "Region
Number" ) + "]" + "}" ) 
(a).
strtoMember("[User].[Login Id].[smv123]") will convert member string expression to a member. Same as
[User].[Login Id].[smv123]").Properties( "Region
Number" ). i.e. Quotes are gone.
(b).
[User].[Login Id].[smv123]").Properties( "Region
Number" ) will return as string "Reg1"
(c) "Reg1" is added to "[Region].[Region Number].[" to make a valid member expression. Complete expression would be : "[Region].[Region Number].[" + "Reg1" + "]"
(d) The above member string expression is converted to a member set by
strtoset( "{" + "[Region].[Region Number].[" + "Reg1" + "]" + + "}" )
(e) So, it is equivalent specifying [Region].[Region Number].[Reg1] in the Advanced security tab. But, since the MDX is evalauted at run time, it will change based on the login id returned by the UserName() function.
(f) Please make sure that you picked [Region] dimension and [Region Number] attribute to enforce dynamic security
2. I am not sure how to write IIF logic in the advanced tab of dimension security. It may be possible. The end result of the MDX in the advanced tab should be a valid member or member set.
regards
Arun