Hi all, I could finally figure out what the error was: The values existed already in the parameters-map. Now I check, whether the parameter is null and if it is the value is taken from the entity and put into parameters. For luck now everything works fine. :-)
>From my opinion this is a bug, on the one hand because the error message is IMHO not usable and on the other can't I imagine a reason why overwriting an existing parameter fails. Up to now we've had no problems when overwriting parameters or stuff in the context or session. Is this perhaps, because a service is in the request chain? The service itself has no output parameters. Shall I open a ticket in JIRA or is the "read-only" behavior wished? And Chris, sorry I've forgotten to thank you for supporting me. Thanks. :-) Best regards, Fabian
