Hi Peter

thanks for the reply...
I've changed the pipeline root to what you noted but still get the error... Maybe we look into this another time.

Creating a new folder, assigning a custom pipeline root, adding the subfolder did work out well, files are added in the assay list for both root and subfolder! (Testing notification call is outstanding, but not today...)
I'll have to figure out the impact on the setup for our user, but that's another story :-)

Cheers,
Jean