Hi,
In 3.1, you can't create BICS connection, this functionality is available from BI 4.0 onwards. If you want to create a report on top of BEx query. Then you can follow below steps:
1. Open Universe designer and create new universe.
2. Specify connection details of your BW server.
3. After that, you will able to see BW objects in Universe Designer.
4. After that save and export that Universe to Repository.
5. Now you can use that universe in InfoView to make report.
If you face any issues while deleoping this. then please let us know.
Cheers
Sahil