I can't wrap my head around this. I'm trying to create a solution to move our structures from one environment to another, and so have crated a custom solution containing only those elements which have been modified by us. To that end - entities we've created from scratch are included in their entirety with metadata, while system entities are only extended with relevant attributes and references.
However, when I attempt to export this solution I'm getting a warning that there are "Missing Required Components". Looking through the list of these, supposedly, missing components I can see relationships (which ARE in the solution) and some views. The views I don't have a problem with - I can understand why those might be missing.
But the relationships have been added as part of the relationship for a given entity. So why do I get a warning? Sure enough, trying to import this solution later on throws the same error on import, that these components are missing.
What's going on here?