Hi MFGF,
i grant permission to tom is Read, Write, Execute, Traverse.
But any way i found solution.
Solu: 1)I went to cognos Admin.
2) i clicked on secuirty tab
3) I selected the tom from my ldap folder and i clicked on his properties .
4) there i found action tab under that portal tab security i clicked on it and i selected dashboard.
when tom login to his portal, Dashboard has been displayed over der..
Thanks.....