Thematic resymbolisation in Bentley Map

Hi folks,

 as Geographics with MSTN 2004 probably damages dgn file using Thematic resymbolisation function I tried to use Bentley Map. I created Map model in my working file  and attached a model with shapes created from original map. All the shapes has database connection according to feature table. I can not find where I did a mistake - when I try to use Thematic Mapping I do not see database atributes when I try tio create new class in Symbology dialog box. Can anybody provide me tipe where I shoudl have a look? I searched through help but did not find anything.

Thanks for help,

   Jiri