Your function example doesn’t work for me. It says this: Error 2 error LNK2019: Reference to non-resolveded external symbol ""public: static int __cdecl UMyEdGraphNode::SomeIntReturningFunction(class FString,class FString &)" (?SomeIntReturningFunction@UMyEdGraphNode@@SAHVFString@@AEAV2@@Z)" in Funktion ""public: void __cdecl UMyEdGraphNode::execSomeIntReturningFunction(struct FFrame &,void * const)" (?execSomeIntReturningFunction@UMyEdGraphNode@@QEAAXAEAUFFrame@@QEAX@Z)". C:\Users\Johnny\Documents\Unreal Projects\EDIFY\Intermediate\ProjectFiles\MyEdGraphNode.cpp.obj EDIFY