Number of participants required before the route can execute.
This numeric value (int32) belongs to FInteractionRuntimeMultiParticipantCommandConfig under InteractionRuntime|MultiParticipant.
Designers configure this value in the owning asset or object details panel, while Blueprint logic can read the resolved value at runtime.
UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "InteractionRuntime|MultiParticipant", meta = (ClampMin = "1"))
int32 RequiredParticipants = 2;