SELECT permission was denied on the object 'mxi_structure_root'

Hi,

After running the help query as mentionned here:

SAP IDM question

I got the error :

The SELECT permission was denied on the object 'mxi_structure_root', database 'mxmc_db', schema 'dbo'.

I tried to connect to the DB with mxmc_db with mxmc_oper and add the permission "select" to the object  "mxi_structure_root" mais no access?

Any help please?

Victoria