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REPORT zzrwtest.

CLASS lcl_alpha DEFINITION FINAL.

  PUBLIC SECTION.
    METHODS main.
    METHODS set_matnr
      IMPORTING matnr TYPE matnr
      RETURNING VALUE(ergebnis) type abap_bool.

ENDCLASS.

CLASS lcl_beta DEFINITION CREATE PRIVATE FINAL.

  PUBLIC SECTION.
    CLASS-METHODS get_instance
      RETURNING VALUE(result) TYPE REF TO lcl_beta.

    METHODS get_data
      IMPORTING
                bla           TYPE char01
                peng          TYPE char01
      RETURNING VALUE(result) TYPE mara.

    METHODS get_matnr
      RETURNING VALUE(result) TYPE matnr.

ENDCLASS.

CLASS lcl_alpha IMPLEMENTATION.

  METHOD main.

    DATA(ergebnis) = me->set_matnr( SWITCH #( lcl_beta=>get_instance( )->get_matnr( )
                                         WHEN lcl_beta=>get_instance( )->get_data( bla = 'A' peng = 'B' )-matnr )
                                         THEN lcl_beta=>get_instance( )->get_data( bla = 'A' peng = 'B' )-matnr )
                                         ELSE SPACE ).

  ENDMETHOD.

ENDCLASS.

CLASS lcl_beta IMPLEMENTATION.

  METHOD get_data.

  ENDMETHOD.

ENDCLASS.