thanks glilienfield
Indeed, in my case, each lineorder is associated with one customer, one part and one date and my relationships are directed as shown in the following diagram:
In any case, your answer was very clear.
In my configuration, if the nodes were on the same path, the question does not arise but as they are not on the same path but all exit from the central lineorder node, I had to make a match between 3 and add a 4th afterwards but I wanted to find the optimal request