Add n number of working days to date using SAP personal work schedule

*&-------------------------------------------------------------*
*&      Form  ADD_WORKING_DAYS_WORKSCHEDULE
*&-------------------------------------------------------------*
*       Add n number of working days to date, using employees
*       work schedule to calculate working days
*--------------------------------------------------------------*
*      <-- P_DAYS     Number of days to add
*      <-- P_PAYDATE  Starting date
*--------------------------------------------------------------*

FORM add_working_days_workschedule USING p_days
                       CHANGING p_paydate TYPE sy-datum.
  DATA: ld_count  TYPE i,
        ld_memid(30) TYPE c.

* Copied from rptpsh10
  DATA: psp LIKE ptpsp      OCCURS 0 WITH HEADER LINE.
  DATA: BEGIN OF hd OCCURS 0,
        pernr LIKE pernr-pernr,
        name(40),
        inv_menge LIKE pakey-seqnr,      "ALV copies only 20 columns!
        moabw LIKE t001p-moabw,                               "
        mover LIKE t001p-mover,          "ALV copies only 20 columns!
        datum LIKE psp-datum,
        kurzt LIKE t246-kurzt,
        tprog LIKE psp-tprog,
        varia LIKE psp-varia,
         ttext LIKE t550s-ttext,
        vtart LIKE p2003-vtart,
         vtext LIKE t556t-vtext,
        motpr LIKE psp-motpr,
        sobeg(8),
        soend(8),
        stdaz LIKE ptev_rep_h-stdaz,
        ftkla LIKE psp-ftkla,
        tagty LIKE psp-tagty,
         tatxt LIKE t553t-langt,
        zmodn LIKE psp-zmodn,
         ptext LIKE t551s-ztext,
        mofid LIKE t508a-mofid,
         ftext LIKE thoct-ltext,
        menge LIKE ptev_rep_h-itanz,
        alvmarker TYPE rp_xfeld,
        END OF hd.

  ld_count = p_days.

  CONCATENATE sy-uname sy-uzeit INTO ld_memid.

* Z version of 'personal work schedule' report, created to export data
* to memory rather than display it on screen
  SUBMIT zrptpsh10_list_to_memory    WITH pnppernr EQ pernr-pernr
                     WITH pnpbegda EQ p2001-begda
                     WITH pnpendda EQ p2001-endda
                     WITH pnpbegps EQ p2001-begda
                     WITH pnpendps EQ p2001-endda
                     WITH pnptimed EQ ' '
                     WITH rdclust  EQ 'X'
                     WITH p_memid  EQ ld_memid
                     AND  RETURN.

* import datd from memoory
  IMPORT hd FROM MEMORY ID ld_memid.

* Check if days are working days
  WHILE ld_count GT 0.
    READ TABLE hd WITH KEY datum = p_paydate.
    IF hd-tprog NE 'FREE'.  "FREE equals non working day
      p_paydate = p_paydate + 1.
      ld_count = ld_count - 1.
    ELSE.
      p_paydate = p_paydate + 1.
    ENDIF.
  ENDWHILE.
ENDFORM.                    " ADD_WORKING_DAYS_WORKSCHEDULE