****************************************************************
* COMPARE TWO TABLES

* TWO TABLE COMPARISON
* LOGIC:  1 - Loop over itab gt_ebill_ca
*         2 - Read itab gt_fkkvkp with key vkont = gt_ebill-vkont
*         3 - At this point we have read one line from each table, for the same vkont
*         4 - Control block
*         5 - MOVE-CORRESPONDING FROM TABLE A TO OUTPUT WORK AREA (IT HAS SAME NAME AS TABLE)
*         6 - MOVE-CORRESPONDING FROM TABLE B TO OUTPUT WORK AREA
*         7 - INCREMENT MISMATCH COUNTER.
*         8 - APPEND CREATED WORK AREA TO OUTPUT.
LOOP AT gt_ebill_ca.

  " Reads a table at specified key
  READ TABLE gt_fkkvkp WITH KEY vkont = gt_ebill_ca-vkont.

  IF      ( gt_ebill_ca-EMAIL_NOTIFY <> gt_fkkvkp-EMAIL_FIS )
      OR  ( gt_ebill_ca-SMS_NOTIFY <> gt_fkkvkp-SMSIN_FIS )
      OR  ( gt_ebill_ca-PAPER_NOTIFY <> gt_fkkvkp-PBILL_FIS ).

            " Increment counter
            ADD 1 to mismatch.

            " populate work areas
            MOVE-CORRESPONDING gt_ebill_ca TO gt_ebill_out.
            MOVE-CORRESPONDING gt_fkkvkp TO gt_ebill_out.
            MOVE gt_fkkvkp-MONTHLY TO gt_ebill_out-FKMONTHLY.
            "MOVE gt_ebill_ca-vkont TO gt_ebill_out-VKONT.
    " append to the out_table
    APPEND gt_ebill_out.

  ENDIF.

  ENDLOOP.

  ********************************************************************