Is there a way to transfer schema and attributes from GIS to DGN?

Hello @jcziesch​, thanks for posting! May I ask how you're changing the reader/writer format currently? It may be easiest to simply add/remove writers or readers as you need them. Note, you can also disable objects in a workspace to have them not be executed at runtime (Right Click > Disable). If you're able to elaborate or use screenshots to demonstrate the issue, I might be able to provide more insight!

Otherwise, have you come across this article yet, where FME Form is used to Convert Parcel Polygons and Lines from Geodatabase to DGN? Happy to help, Kailin.