GOTCHA: UML/SysML: Cameo Simulation Toolkit 19SP3: A [true] or [false] guard on an ActivityEdge MUST be a LiteralBoolean, not just characters typed in, or the evaluation may give unexpected or ill-defined results
A LiteralBoolean is shown as either the word “true” or the word “false,” corresponding to its value. Source Unified Modeling Language 2.5.1
A LiteralBoolean specifies a constant value of the PrimitiveType Boolean. Source Unified Modeling Language 2.5.1