Such an interesting system. It would be like allowing each state of the US to have a seat at the table for treaty and trade negotiations. Chaos would ensue. It's a wonder the German Empire lasted as long as it did.
The right formerly claimed by the states of the German Empire of associating delegates or ambassadors of their own with those of the emperor in treaties and negotiations relating to the public concerns of the empire; hence distinguished from legation or the sending of envoys on the private affairs of each state.