>I have been able to do this, and eventually, getting aroung Visual Studio crashes and such, running the report. But nowhere have I managed to pass the primary key to the stored procedure to limit the report to one set of data. The SP accepted one parameter and this parameter can be 0 to retreive all the data.
>
>Also, I have all my datasets in a separate project but I have no way to access these datasets from a report. I have to create the dataset for the report under app-code.

The way I do it is as follows:
1) write SP for data
2) Generate XML dataset from SP
3) Create report.
4) Set dataset to report for design purposes.
5) Tweak report layout.
---
6) Open report requesting interface.
7) Add code for running SP and getting dataset back
8) I now bind the report object from above to the DATASET I just pulled.
9) Report is now rendered.

It seems that your asking the report to do something with the params and pass them back to the backend? Why ???

Is this easier?