Deriving from UBlueprint class

Development Programming & Scripting Blueprint
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1

I know this is pretty advanced topic, and there is no documentation available regarding this, but I am hoping if someone proficient in creating editor tools has ever derived from UBlueprint class to create custom Blueprint graph(like AnimBlueprint or WidgetBlueprint). Deriving from UBlueprint class to create editor tools in ue4 is throwing Map Validation Check error. I am not sure what I am doing wrong. Everything works perfectly if my editor asset is derived from UObject instead, but I need the functionalities of an Event Graph.
https://www.youtube.com/watch?v=Mak-DUuW8sE

2

It seems like you blueprint asset don’t generate UClass, maybe specifically when you hit save with doing nothing, as this is validation condition for UBlueprint:

 EDataValidationResult UBlueprint::IsDataValid(TArray<FText>& ValidationErrors)
 {
     return GeneratedClass ? GeneratedClass->GetDefaultObject()->IsDataValid(ValidationErrors) : EDataValidationResult::Invalid;
 }

You could override this function in you asset class to make those messages dissaper, but the problem might be still there and can cause farther issues. If you make blueprint code that VM needs to generate the UClass to work properly on runtime, as actors and objects are spawned form UClass not UBlueprint, so make sure GeneratedClass work properly, matbe compile your blueprint before save.