Unable to open drill through report from cognos connection

[paloalto_cognos]

Hi,

We have few reports which have drill through functionality but when I  click on the hyperlink of the drill through the reports do not work.

The reason behind this is because of the default values in the prompt.
There are certain default values which are not passed when nothing is selected when the report is run.

This happens only in cognos connection, works fine when report is run from report studio.

Any suggestions... pls