Does anyone know how to implement a custom relationship field?
I can see it's done for a couple of core modules like Accounts -> Contacts and Opportunities -> Contacts.
In both modules the relationship table has a field called contact_role that can be edited directly in the subpanel list of records.
Now I have two custom modules and a many to many relationship between them. I want to add a field to the relationship and make it appear in the subpanel where it can be edited.
I've read this link
but it's very old and doesn't work for me. (I'm on Sugar 7.9).