Relationship.relationship_name != concept.concept_name

@Sigfried_Gold:

Well, is_hierarchical really means is a relationships that is meaningful in a hierarchical structure. But if you go from one vocabulary to another using a lateral step in order to continue the hierarchy there, it makes a lot of sense. Those 1s and 0s are counted in order to get the right min_levels_of_separation. So, makes a lot of sense.

But we should probably improve the documentation.

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