ArcMap 10.6.1
Step 1: I create a new feature class 'TEST' with 3D data (RD new, NAP)
Step 2: Use the editor and add 1 feature, where one of the Z-values is not zero.
Step 3: Create a view with: SELECT * FROM TEST
Step 4: Try to 'Register with Geodatabase'
Step 4 fails. If I delete the feature and add a new feature where the Z-values are zero, it is possible to register the view.
Why is it not possible to register a view with Z-values?