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I would like to share the following in case you encounter the same issue. Class and Record Helpers (Delphi) - RAD Studio states that: Actually, this is not entirely correct. Consider the following: Unit HelperUnit1.pas: TObjectHelper1 = class helper for TObject procedure Test; end; Unit2 HelperUnit2.pas: TObjectHelper2 = class helper for TObject procedure Test; end; Unit SupportClasses,pas: uses HelperUnit1; type TMyClass: class end; Unit MainUnit.pas interface implementation uses SupportClasses, HelperUnit2; begin var MyClass:= TMyClass.Create; MyClass.Test; end; MyClass.Test will use the HelperUnit1.TObjectHelper1.Test implementation even if HelperUnit1 is not even in scope, let alone being "in nearest scope". So it appears that if a class helper is in scope where a class is defined, it is used unconditionally in all units of a project. If not, then what it is stated in the documentation applies.