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I just found out how it works, respectively why it did not work before. Still this seems VERY strange to me.
The thing is, that where you add the parameters to the OParameterCollection, it seems you have to pass an adequately large value, even for an OUT parameter. I originally passed an empty string, because I thought this is not used afterwards anyway.
However, resulting from an empty string, a return value of max. 127 characters was possible. When I passed an char, I could also retrieve values of 4000 characters.
As I said, it still seems strange to me!
If anybody can give me more insight?