Relationships

While refining the Related Terms where we use the concept to concept relationship; one of the relationship is 'indicates' and 'has symptom'. But I feel that it would be better if it is 'indicates' and 'is indicated by' as for some terms the earlier relation would not fit properly. Example:'extensographs' indicates 'rheological properties' but the reverse will not give proper meaning.May be we need to think of a better relationship.