Adding Explicit Enhancement to custom program

 here i have develop explicit Enhancement  repalce code as per the requirments here previou code not goging to execute your code get executed at time one active enhacments can we run enhacment
*-----------------------------------------------------------------------
*  Report  Zdev                                                        *
*                                                                      *
*----------------------------------------------------------------------*
*                                                                      *
*   Author..............    :   rohini kumar                           *
*   Creation Date.......    :                                          *
*   Requested by........    :                                          *
*   Reference document..    :                                          *
*   Project.............    :                                          *
*   Description.........    :                                          *
*----------------------------------------------------------------------*
* Modification History :                                               *
*                                                                      *
*   Author      Date    Correction #   Purpose/Reason                  *
*  --------   --------  ------------   --------------------------------*
*                                                                      *
*  --------   --------  ------------   --------------------------------*

REPORT  zdev.
TABLES : vbak, vbap.
DATA : it_vbak TYPE STANDARD TABLE OF vbak INITIAL SIZE 0,
      wa_vbak TYPE vbak,
      it_vbap TYPE STANDARD TABLE OF vbap INITIAL SIZE 0,
      wa_vbap TYPE vbap.

INITIALIZATION.
  REFRESH : it_vbak,
  it_vbap.
  CLEAR : wa_vbak,
  wa_vbap.

START-OF-SELECTION.
ENHANCEMENT-SECTION ZMM_ENHANCMENTS SPOTS ZMM_IMPLEMNETS_SPOT .
  SELECT *
  FROM vbap
  INTO TABLE it_vbap[]
  UP TO 15 ROWS.


  WRITE: /02 'Sales Document',
  20 'Date',
  40 'Time',
  65 'Name of Person'.
  ULINE .
  IF it_vbap[] IS NOT INITIAL.
    LOOP AT it_vbap INTO wa_vbap.
      WRITE: /02 wa_vbap-vbeln,
      20 wa_vbap-posnr,
      40 wa_vbap-matnr,
      65 wa_vbap-matwa.
    ENDLOOP.
  ENDIF.
END-ENHANCEMENT-SECTION.
*$*$-Start: ZMM_ENHANCMENTS---------------------------------------------------------------------$*$*
ENHANCEMENT 1  ZMM_ENHANCMENTS.    "active version
  SELECT *
  FROM VBAP
  INTO TABLE IT_VBAP[]
  UP TO 5 ROWS.


  WRITE: /02 'Sales Document',
  20 'Date',
  40 'Time',
  65 'Name of Person'.
  ULINE .
  IF IT_VBAP[] IS NOT INITIAL.
    LOOP AT IT_VBAP INTO WA_VBAP.
      WRITE: /02 WA_VBAP-VBELN,
      20 WA_VBAP-POSNR,
      40 WA_VBAP-MATNR,
      65 WA_VBAP-MATWA.
    ENDLOOP.
  ENDIF.
ENDENHANCEMENT.
*$*$-End:   ZMM_ENHANCMENTS---------------------------------------------------------------------$*$*