ALV with field catalog merge

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Example ALV report with field catalog merge in SAP ABAP. 
REPORT  ZALV_WITH_FCAT_MERGE.

TYPE-POOLS SLIS .

DATA : BEGIN OF I_MARA OCCURS 0,
        MATNR LIKE MARA-MATNR,
        MTART LIKE MARA-MTART,
        MBRSH LIKE MARA-MBRSH,
        MEINS LIKE MARA-MEINS,
      END OF I_MARA.



DATA : I_FCAT TYPE SLIS_T_FIELDCAT_ALV .
DATA : WA_FCAT LIKE LINE OF I_FCAT .

START-OF-SELECTION .
  PERFORM GET_DATA .
*  PERFORM CREATE_FCAT.
  PERFORM CREATE_FCAT_MERGE .

END-OF-SELECTION .
  PERFORM DISP_ALV .
FORM GET_DATA .
  SELECT * FROM MARA
      INTO CORRESPONDING FIELDS OF TABLE I_MARA
       .
ENDFORM.                    " GET_DATA
FORM DISP_ALV .
  CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
    EXPORTING
      I_CALLBACK_PROGRAM = SY-REPID
      IT_FIELDCAT        = I_FCAT
    TABLES
      T_OUTTAB           = I_MARA.


ENDFORM.                    " DISP_ALV
FORM CREATE_FCAT .


  WA_FCAT-COL_POS = '1' .
  WA_FCAT-FIELDNAME = 'MATNR' .
  WA_FCAT-TABNAME = 'I_MARA' .
  WA_FCAT-SELTEXT_M = 'MATERIALNO' .
  WA_FCAT-KEY = 'X' .
  APPEND WA_FCAT TO I_FCAT .
  CLEAR WA_FCAT .

  WA_FCAT-COL_POS = '2' .
  WA_FCAT-FIELDNAME = 'MTART' .
  WA_FCAT-TABNAME = 'I_MARA' .
  WA_FCAT-SELTEXT_M = 'MATERIALTYPE' .
*  WA_FCAT-NO_OUT = 'X' .
  WA_FCAT-HOTSPOT = 'X' .
  APPEND WA_FCAT TO I_FCAT .
  CLEAR WA_FCAT .

  WA_FCAT-COL_POS = '3' .
  WA_FCAT-FIELDNAME = 'MBRSH' .
  WA_FCAT-REF_FIELDNAME = 'MBRSH' .
  WA_FCAT-REF_TABNAME = 'MARA' .
*  WA_FCAT-TABNAME = 'I_MARA' .
*  WA_FCAT-SELTEXT_M = 'INDSECTOR' .
*  WA_FCAT-EDIT = 'X' .
  APPEND WA_FCAT TO I_FCAT .
  CLEAR WA_FCAT .

  WA_FCAT-COL_POS = '4' .
  WA_FCAT-FIELDNAME = 'MEINS' .
  WA_FCAT-TABNAME = 'I_MARA' .
  WA_FCAT-SELTEXT_M = 'MAT.UNITS' .
  WA_FCAT-EMPHASIZE = 'C610'.
  APPEND WA_FCAT TO I_FCAT .
  CLEAR WA_FCAT .

ENDFORM.                    " CREATE_FCAT
FORM CREATE_FCAT_MERGE .
  CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE'
    EXPORTING
      I_PROGRAM_NAME     = SY-REPID
      I_INTERNAL_TABNAME = 'I_MARA'
      I_INCLNAME         = SY-REPID
    CHANGING
      CT_FIELDCAT        = I_FCAT.
********************MODIFYING AUTOMATIC FILEDCATOG
  LOOP AT I_FCAT INTO WA_FCAT.
    IF WA_FCAT-FIELDNAME = 'MBRSH' .
      WA_FCAT-NO_OUT = 'X' .
    ENDIF .
    MODIFY I_FCAT FROM WA_FCAT INDEX SY-TABIX .
  ENDLOOP.
ENDFORM.                    " CREATE_FCAT_MERGE

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