Customer Hierarchy

R25.1 Update 3 On customer hierachy i can create hierarchy levels but I cannot connect customers to a level. The hierarchy is then defined by which customer are connected to which 
Ex. Hierarchy Root level = Main
Connected customer, concern cusotmer becomes level 1
one or more connected customer to the concern then becomes level 2
A customer can be connected to a customer in level 2 and then becomes level 3

But in Rebate agreements I can only connect to the Root level and the calculation does not work. In the tabel rebate_transaction the invoiced line is added, but without any calculation. 
It works when I dont use customer hierarchy. 
For my example I have used a very limited setup. Part based on one specific part, and with Amount on sold quantity. 
Any idea as to what the problem might be?