It’s best to add the main work name to all work parts You should also add composer (and lyricist when relevant) to the parts - in most cases that will be easy because you’ll have different tracks for each part and you’ll link to them directly in the relationship editor, but in this case it’s a bit more annoying
I made the changes myself here.
I also made changes to the recording artists to follow the recording artist guideline -but do not do that by hand, see the scripts part from The Classical Editor Toolbox and get some scripts