The following ABAP code adds n number of WORKING days to a particular date, any days which are not
workings days (i.e. Saturday) will be ignored. For example if your starting date is Friday, adding 3 days
would return a result of Wednesday or if starting date was Wednesday resultant day would be Monday as
Saturday and Sunday are non working days. If you want to add n number of working days but allow result
to be a non working day then click here for alternative ABAP code.

Simply add the below FORM into you code and call it using the usual PERFORM command:   PERFORM add_working_days USING ld_numdays
                            CHANGING gd_date.

*&---------------------------------------------------------------------*
*&      Form  ADD_WORKING_DAYS
*&---------------------------------------------------------------------*
*       Add n number of factory days(working days) to date
*----------------------------------------------------------------------*
*      <-- P_DAYS     Number of days to add
*      <-- P_PAYDATE  Starting date
*----------------------------------------------------------------------*
FORM add_working_days USING p_days
                      CHANGING p_paydate TYPE sy-datum.
  DATA: gd_factorydat LIKE scal-facdate,
        gd_resdate    LIKE sy-datum.

* Convert date to factory date
  CALL FUNCTION 'DATE_CONVERT_TO_FACTORYDATE'
       EXPORTING
            date                = p_paydate  "Starting date
            factory_calendar_id = 'GB'
       IMPORTING
            factorydate         = gd_factorydat. "Factory calender date

* Add n number of days to factory date, ignors non working days
  gd_factorydat =  gd_factorydat + p_days.

* Convert factory date back to actual date
  CALL FUNCTION 'FACTORYDATE_CONVERT_TO_DATE'
       EXPORTING
            factorydate         = gd_factorydat
            factory_calendar_id = 'GB'
       IMPORTING
            date                = gd_resdate. "Actual date

  p_paydate = gd_resdate.
ENDFORM.                    " ADD_WORKING_DAYS