(ROSE) Use Case Diagram

[Angela Servedio]

Hello all, My problem is following:    Use Case "Ordini"   Sequence Diagram 1  with Actor "Responsible"   Sequence Diagram 2  with Actor "User"   Is possible to associate the two actors to the same Use Case?  Or they must be created two Use Case?  That is:   Use Case "Ordini_1"   Sequence Diagram 1  with Actor "Responsible"       Use Case "Ordini_2"   Sequence Diagram 1  with Actor "User"     Thanks for any help.