In BOL, topic "Granting Read Metadata Permissions"
(ms-help://MS.SQLCC.v9/MS.SQLSVR.v9.en/uas9/html/c857e48e-64b0-4ffe-900d-a0a3ddafcefb.htm),
we can read:

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Granting Read Metadata Permissions on a Cube Giving a database role
permission to read the metadata of a cube gives the role permission to read
the definition of a cube. Experienced analysts and developers may need to
view the definition of objects in the cube in the course of their work.
However, for security reasons, the definition of cube objects should not be
visible to most business users. The existence of this permission enables
administrators to grant certain users the permission to view object
definitions in a particular cube without also granting them the permission
to modify these objects or view objects in other cubes.
To give a database role permission to read the metadata of a cube
In SQL Server Management Studio, connect to the instance of Analysis
Services, , expand Roles for the appropriate database in Object Explorer,
and then click a database role (or create a new database role).
Click Cube Access in the Select a Page pane, locate the cube in the Cube
list, and then select the Read Definition check box for that cube.
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I can't see the Read Definition check box. Also, there is only "Cube"
option, not "Cube Access". Am I missing something, are BOL wrong, or is it a
bug in SSMS?

Thanks,

--
Dejan Sarka