Modify export data source

Hello friends,

I am in need for some advice for modifying an export data source.

My scenario is as following: I have a cube for which i would like to generate a datasource in order to export some of its contents to a second cube.

That means i would like to "erase" or hide some of the infoobjects present in the first cube from the generated export datasource.

In rsa6 i cannot set the hide flag for those fields.

In rsa2 i see that the field attribute for the infoobjects i would like to hide is set to 'X' whereas i would like to have a '3' instead.

Can someone guide on the procedure of setting the field attribute for the export datasource?

Thanks,

Gili