Wrong element defined in required field

[Jonas-To]

The naming discussion about legal_entity vs legal_person has led to the situation where
The required block on line 215 requires legal_entity, but only legal_person and legal_representative are defined in the schema block above.

This should NOT be considered input to what it should be called, this is just a fix to make the JSON schema valid.

(alternatively we could change the object name on line 49, but multiple instances below use the same name + something more. )

So suggesting fix on line 216 as a quick fix, until the decision on actual name is landed so that the schema is valid.