Both side relations
It would be great to see the relations between cards on both of them, not just on cards from which the relation was made, but also on cadrs, to wich it relates.
Bi-directionnal relationships are possible if both cards share the same “relationship” attribute.
AdminJérôme (Support Team, Kantree) commented
For many-to-many relationships you can use the "card relationships" attribute type. The previous "card" type has been renamed "Board as data source".
Yes but the link should support one to many or better many to many cards. I may be wrong but it seems that currently the card link attribute can only refer to one single card.