Within the User Parameters I have added the option to Select a File.
More specific the user has the option to select a Geodatabase (Items to Select).
When the user has selected the Geodatabase, I like to have the user also select the database of his/her own choice within that Geodatabase. Is there a way to configure that?
Found the answer shortly after I've posted the question ;-)
Inspired by this post:
Not using the option Manage User Parameters, but from within a reader you add user parameters:
...When the user has selected the Geodatabase, I like to have the user also select the database of his/her own choice within that Geodatabase. Is there a way to configure that?
I think you mean dataset or featureclass instead of database. But I do not know of a way to do this other than with predefined values.