International characters in parameters to report, via RWServlet

Hello,
I'm having problems passing parameters with Swedish characters (e.g. e, d, v) to my reports, when the reports are accessed from the web using the RWServlet.
I get no matches for these parameters, but I do when the reports are run in the Report Builder.
The machine is running SunOS 5.7, and the RWServlet is running in a WebLogic Server.
The NLS_LANG environment variable is set to AMERICAN_AMERICA.WE8ISO8859P1 when running the Reports Server and the same encoding is used in the database.
In the URL used to run the report I specify the Swedish characters using the same encoding (ISO-8859-1), like this:
http://servername/RWServlet?...&param=N%E4ssj%F6
Has anyone encountered the same problem, or do you know what I might be doing wrong?

Encountered the same problem (two years later). Did you ever find a solution?

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