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    Problem in Blueprint node Reference

    Hi all:

    I have some blueprint port from UE4.12, Now I am working with UE4.14.3.
    Recently days, I found a Blueprint class(named BP_A) always Reference another Blueprint(named BP_B).
    I have cleaned Event Graph, Funtions and Variable, everything from BP_A. But When use Reference-Viewer, I saw a Reference connect from BP_B.
    Because BP_B is a huge blueprint, I wish clean some assert reference to shrink memory cost. So I do not want BP_A reference BP_B.
    I used UE4 Editor export, export assert BP_A to a .COPY file. I found some Object Section have BP_B Name.
    Why BP_B is In .COPY file, but not show in Blueprint Editor of BP_A?
    I guess this is problem of porting UE4.12. Maybe UE4.14 hide this node.

    How can I derefernce this Graph Node?
    Thanks.

    Below are some fraction of .COPY, Character_BP is BP_B. Thanks.

    Begin Object Name="EventGraph"
    Begin Object Name="K2Node_VariableSet_757"
    VariableReference=(MemberName="NetMode",MemberGuid=305FF68245F7FDE5A081949DC546922F,bSelfContext=True)
    NodePosX=-1152
    NodePosY=3920
    NodeGuid=E0D3624843D2D050AD507280BF689DE1
    CustomProperties Pin (...)
    CustomProperties Pin (...)
    CustomProperties Pin (...)
    CustomProperties Pin (PinId=B87B67B14C3240AFB0D7369FE99EF90D,PinName="self",PinFriendlyName=NSLOCTEXT("K2Node", "Target", "Target"),PinType.PinCategory="object",PinType.PinSubCategory="",PinType.PinSubCategoryObject=BlueprintGeneratedClass'/Game/Characters/Character_BP.Character_BP_C',PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PersistentGuid=00000000000000000000000000000000,bHidden=True,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
    CustomProperties Pin (...)
    End Object
    Schema=Class'/Script/BlueprintGraph.EdGraphSchema_K2'
    bAllowDeletion=False
    GraphGuid=55D7986944968C70AD2DF9BD2B439DBA
    End Object
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