Can we design Part 2 in such a way that there are calls between components of the same layer? say an EJB calling another EJB?.
My scenario is I have a common use case X that is reused by 2 other use cases Y and Z(Y & Z have their own set of operations to perform apart from X). Can I design it in such a way that Use case X is done by an EJB and that this EJB is being called by EJBs that do Y & Z ? I have never seen an example diagram showing such an interaction between components in the same layer