Tips by: Prem endren

Sapscript coding :-
*************************
/:   PERFORM F_58_GROSS IN PROGRAM ZFI_PMT_ADV
/:   USING &REGUP-DMBTR&
/:   USING &REGUP-DMBT1&
/:   USING &REGUP-DMBT2&
/:   USING &REGUP-SKFBT&
/:   CHANGING &W_DMBTR&
/:   CHANGING &W_DMBT1&
/:   CHANGING &W_DMBT2&
/:   ENDPERFORM
T1   &REGUP-BELNR&,,&REGUP-XBLNR&,,&REGUP-BLDAT& &W_DMBTR(16T)

Note:- here we passed USING parameters & got CHANGING parameters

Abap coding :-
********************
Program name :-  ZFI_PMT_ADV

FORM f_58_gross TABLES in_par STRUCTURE itcsy out_par STRUCTURE itcsy.

  DATA : dmbtr LIKE regup-dmbtr,
         dmbt1 LIKE regup-dmbt1,
         dmbt2 LIKE regup-dmbt2,
         skfbt LIKE regup-skfbt,
         rdmbtr LIKE regup-dmbtr,
         rdmbt1 LIKE regup-dmbt1,
         rdmbt2 LIKE regup-dmbt2,
         temp(16) TYPE c,
         temp1 TYPE p.

  READ TABLE in_par WITH KEY 'REGUP-DMBTR'.
  CHECK sy-subrc = 0.
  temp = in_par-value.
  CONDENSE temp.
  REPLACE ALL OCCURRENCES OF ',' IN temp WITH ''.
  temp1 = temp.
  dmbtr = temp1.
  READ TABLE in_par WITH KEY 'REGUP-DMBT1'.
  CHECK sy-subrc = 0.
  temp = in_par-value.
  CONDENSE temp.
  REPLACE ALL OCCURRENCES OF ',' IN temp WITH ''.
  temp1 = temp.
  MOVE temp1 TO dmbt1.
  READ TABLE in_par WITH KEY 'REGUP-DMBT2'.
  CHECK sy-subrc = 0.
  temp = in_par-value.
  CONDENSE temp.
  REPLACE ALL OCCURRENCES OF ',' IN temp WITH ''.
  temp1 = temp.
  MOVE temp1 TO dmbt2.
  READ TABLE in_par WITH KEY 'REGUP-SKFBT'.
  CHECK sy-subrc = 0.
  temp = in_par-value.
  CONDENSE temp.
  REPLACE ALL OCCURRENCES OF ',' IN temp WITH ''.
  temp1 = temp.
  MOVE temp1 TO skfbt.

  rdmbtr = dmbt1 + dmbt2.
  rdmbt1 = rdmbtr - dmbtr.
  rdmbt2 = 0.

  IF dmbt1 EQ 0.
    IF skfbt LT dmbtr.
      rdmbtr = dmbtr.
      rdmbt1 = 0.
    ELSE.
      rdmbtr = skfbt.
      rdmbt1 = skfbt - dmbtr.
    ENDIF.
  ENDIF.

  REFRESH out_par.
  temp = rdmbtr.
  out_par-name = 'W_DMBTR'.
  out_par-value = temp.
  APPEND out_par.
  temp = rdmbt1.
  out_par-name = 'W_DMBT1'.
  out_par-value = temp.
  APPEND out_par.
  temp = rdmbt2.
  out_par-name = 'W_DMBT2'.
  out_par-value = temp.
  APPEND out_par.

ENDFORM.

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