Unable to edit the decision table with Rules Manager

Hi Gurus,

I am trying to update the decision table in BRM using the rules manager.

But there is no option of export/import rather there is no editing possible at all .

I am referring this blog.

  http://scn.sap.com/docs/DOC-51351

I added the user roles SAP_BRM_Admin and SAP_BRM_NWA_Admin also to my user but still unable to do so.

Can you please guide me on this to edit the decision table?

Highly appreciate quick responses as it is really on a huge priority for me.

Thanks buddies,