UML-2.5.1 does NOT permit a trigger or guard on a Transition from an initial pseudostate in a StateMachine but Cameo/MagicDraw does (please avoid).

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Note kind
ISSUE
TOOL
WARNING
Policy level
INFORMATIVE
UML keywords
PseudostateKind::initial
Transition
Transition::trigger
Transition::guard
StateMachine
StateMachine Diagram
Keywords
UML-2.5.1: 'initial - ... It is the source for at most one Transition, which may have an associated effect Behavior, but not an associated trigger or guard.'
The reason MagicDraw/Cameo nevertheless supports such is historical, it was initially based on SCXML.
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Related snippets (extracts)
  [UML-2.5.1] initial - ... It is the source for at most one Transition, which may have an associated effect Behavior, but not an associated trigger or guard.
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