I'm not exactly sure on your needs but what you probably want is to set your base ring product as "make_to_stock", and an order point rule with minimum stock=0 and order quantity = 20.
It shouldn't create 2 purchase orders of 20... something must be missconfigured. Regards, Pedro _______________________________________________ Tinyerp-users mailing list http://tiny.be/mailman/listinfo/tinyerp-users
