You can see how to send parameters to OpenDoc in the documentation. Go to http://help.sap.com/bobip, click on "Development Information" and get the OpenDocument documentation for the version of BO you're using.
The Crystal part of the RESTful Web Services only work with Crystal if the report is a Crystal for Enterprise report. It does NOT work with "classic" Crystal Reports. You can access the documentation at the link above, also under "Development Information".
-Dell