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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