A function that will return next business day, based on the country. 
This function will allow users to specify e.g. 10 business days from now. 
Here is the code. 
Code: 
REPORT  ZRM_TEST                      . 
PARAMETERS: DATE_1 LIKE SY-DATUM DEFAULT SY-DATUM, 
            BIZ_DAYS TYPE I DEFAULT 2, 
            FACCALID LIKE SCAL-FCALID DEFAULT 'US'. 
DATA:       FAC_DATE_1 LIKE SCAL-FACDATE, 
            DATE_2 LIKE SY-DATUM, 
            FAC_DATE_2 LIKE SCAL-FACDATE. 
CALL FUNCTION 'DATE_CONVERT_TO_FACTORYDATE' 
     EXPORTING 
          DATE                         = DATE_1 
          FACTORY_CALENDAR_ID          = FACCALID 
     IMPORTING 
       FACTORYDATE                  = FAC_DATE_1 . 
FAC_DATE_2 = ABS( FAC_DATE_1 + BIZ_DAYS ). 
CALL FUNCTION 'FACTORYDATE_CONVERT_TO_DATE' 
  EXPORTING 
    factorydate                        = FAC_DATE_2 
    factory_calendar_id                = FACCALID 
  IMPORTING 
    DATE                               = DATE_2 
. 
WRITE: / DATE_2. 
 
You can also try the function module DAY_ATTRIBUTES_GET. 
You need to provide the calendar and a time interval, and the fm returns an internal table showing days with flags holiday / working day. 

Serkan AKKAVAK
Computer Engineer
ABAP Developer & SAP MM SD Consultant
Contact : serkurumsal@yandex.com