I have a PostgreSQL/PostGIS database with a base table (
Pois_points) and two subtables which constitute a many-to-many relationship with the base table, as you can see on the picture below (click on Many to many relationships).
I want to build a QGIS form that depicts this relationship between the tables when adding and editing items. I have seen examples of a one-to-many relationship in QGIS, which is relatively easy. But many-to-many is not documented or maybe not possible at all?