Hi Adam and all the other who are interested,
My problem is solved. It was a long time that I worked with Impromtu, so..
I use the Tipe In-prompt offcourse.. 3 different, in my case. With the 3 messures I create, I calculate the volume-field. To calculate the volume/weight field, I use the Report Columns in the Querry/Calculation to get the volume field..
Cognos rueles ;-)
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Best Regards,
Fabrice