Service Broker and procedure which contains Execute as
Answer is here:
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/95f5ee43-d3b2-4a2d-bdd2-6fb0aed56458/service-broker-and-procedure-which-contains-execute-as?forum=sqlservicebroker&amp;prof=required 
In short: I perform in the context of the current database and treated in a nearby base. And it requires action from the links above.