Data Modeler for MDG

Hi Team,

Is there any Data modeler available in SAP MDG where I can go an perform data modelling activities(Like Erwin). I'm looking for a tool to build a logical data model.

I can see a Visualize Data modeler in MDGIMG where I can view the data model rather than able to work on it. Also feel it is a webdynpro application and I assume it can only act as a view only and not editable.

Any pointers would be helpful.

Thanks

Bala