UTP12 — Invalid Figure B.14

Given by constraint 6 of UML::Message (Section 14.3.18 in UML 2.4 Superstructure), messages are not allowed to cross boundaries of a CombinedFragment. Gates manage the connection of messages outside of a CombinedFragment to messages inside the CombinedFragment. So, in general, a cfragmentGate should be used in this Figure.

However, in picture B.14 a Default is depicted. Defaults express behavior for exceptional situation within a test case specfication, so actually, the behavior of a Default is added to the receiving test component lifeline for a particular message (shown in Figure B.13), or for a set of messages (not mentioned in the spec at all). Thus, the two boundary-crossing messages shown in B.14 do not have a real counterpart in Figure B.13 (they are just additional messages).

For resolution, I suggest to use found messages (UML::Message with MessageKind::Found) within the InteractionOperands of the determAlt CombinedFragment, to indicate they are additional message for which no real counterparts exists in the interaction applying a Default.