Will be reintroduced properly afterward. Currently, even if the field is defined using ondelete='set null', the M2M relation doesn't handle the fact that the target table is a real model and not a simple relational table. closes odoo/odoo#116880 X-original-commit: f58d2ad669710a353263e418bbf69f5f49145cac Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>