How to create a DataAsset variable in C++？

Development Programming & Scripting
1

Why C++ object reference can only choose template？How can I make C++ variable the same as the Blueprint？
C++ Code：

    UPROPERTY(EditAnywhere, BlueprintReadOnly, Instanced, Category = "ItemData")
    class UProductItem* ItemAsset;

C++

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BP

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2

Help！！！！！！

3

Dont set “DefaultToInstanced” in base class!!!