[Flag] WBEM_FLAG_UPDATE_COMPATIBLE [Meaning] 
This flag allows a class to be updated if there are no derived classes and there are no instances for that class. It also allows updates in all cases if the change is just to nonimportant qualifiers (for example, the Description qualifier). This is the default behavior for this call and is used for compatibility with previous versions of Windows Management. If the class has instances or changes are to important qualifiers, the update fails.