You can delete the contents of a cube’s write-back table by using the Delete Write-Back Data dialog box.
Important When you delete the write-back data for a cube, all read/write permissions for the cube are disabled, and users will not be able to change displayed cube data. (Users with disabled read/write permissions will still be able to browse the cube.) Read permissions are not affected.
To delete write-back data for a cube and disable read/write permissions