Don't call static methods through instance variables

For calling a static method, use

cl_my_class=>static_method( ).

Instead of calling it through an instance variable to cl_my_class

" anti-pattern
lo_my_instance->static_method( ).

A static method is attached to the class itself, and calling it through an instance variable is a potential source of confusion.

It’s OK to call a static method of the same class without qualifying it within another static method.

METHOD static_method.
  another_static_method( ).
  yet_another( ).
ENDMETHOD.

However, within an instance method, even when calling a static method of the same class, you should still qualify the call with the class name:

CLASS cl_my_class IMPLEMENTATION.

  METHOD instance_method.
    cl_my_class=>a_static_method( ).
    another_instance_method( ).
  ENDMETHOD.

  ...