How update uproperty value in derived class?

How i can update displayName UProperty value in child class (UuazVehicle_C) to “uaz”?
Tried this (no work. UuazVehicle_C class have parent displayName UProperty value - “baseCar”):

UCLASS(Blueprintable)
class Ubase_car_C : public UAll_C { //derived from UObject
	GENERATED_BODY()

	UPROPERTY(EditAnywhere,BlueprintReadWrite) FString displayName;

	public: Ubase_car_C() {
		displayName = "baseCar";
		UE_LOG(LogTemp, Warning, TEXT("constructor Ubase_car_C"));
	};
};
UCLASS(Blueprintable)
class UuazVehicle_C : public Ubase_car_C {
	GENERATED_BODY()

	FString displayName;

	public: UuazVehicle_C() {
		displayName = "uaz";
		UE_LOG(LogTemp, Warning, TEXT("constructor UuazVehicle_C"));
	};
};

problem resolved:
my error:
re-declaration of a class member in the body of the derived class (after this action - dont’ can update property value, property have parent(base) value)
need delete 16 line