Routing selection in Production Order when using ECN in Routing

Hi experts,

I'm having some trouble with routing selection when using ECN in routing creation.

I tested a case where I have 3 routings without ECN, and the Order asked me which one of the 3 I want to use.

Then I created a routing with ECN. The order asked only one routing without ECN and the new routing with ECN.

Do you know if there is any relation about using the ECN in Routings and using at the same time Routings without ECN, when selecting the routing in production order?

Anybody can help?

Thank you,

Caio.