I'm working in SSRS 2008 R2 and pulling from ODBC to an AS400 DB2 into a dataset.
Because of this - I can only define a parameter in the SQL as a "?" - and can't assign it a name.
When I try to create a default value for the parameter - it will show perfectly in Dev... but when deployed (to simple web report - no Sharepoint involved)... the default values are hit and miss... some showed, some didn't.
To top it off - when I removed them... the default values keep showing in production.
NOTE - pulling the data over to SQL Server is currently off the table - long project and too many higher priorities.