Hi, When there any changes in employee payment, hiring, lop absence, termination/resignation...when these changes occured in the employee master data, then system will read the XPPF rule. XPPF : this is main rule in factoring and reading the partial period factors XPP0: This is sub rule for XPPF and reading the different pariial periods that ie, basic pay change, termination, unpaid absence, entry in the month. XPP1:This is sub rule for XPP0, reading the business process here on each partial periods. Test the each partial period, then you can come to know the process of factoring rule. Regards, Devi. http://wikinewforum.info/showthread.php?168824-Employee-Ticket-Management-(Saudi-Arabia)-Part3 http://brainfryblogging.blogspot.com/2011/03/calculation-rules-for-factors-801.html https://books.google.com.sa/books?id=y7K_vUrn2TgC&pg=PA66&lpg=PA66&dq=sap+hr+what+is++the+ diffference+between+/801+and+/802&source=bl&ots=LU-EBDNE8_&sig=NFO7Pn8ju3pzB23xmdbsbBhIYI&hl=en&sa=X&ved=0ahUKEwjlrN3JytnYAhVE2KQKHbpRA2AQ6AEINTAB#v=onepage&q=sap%20 hr%20what%20is%20%20the%20diffference%20between%20%2F801%20and%20%2F802&f=false https://archive.sap.com/discussions/thread/1789960 https://help.sap.com/saphelp_erp60_sp/helpdata/en/a3/cade537187424de10000000a174cb4/framese t.htm https://books.google.com.sa/books?id=y7K_vUrn2TgC&pg=PA66&lpg=PA66&dq=sap+hr+what+is++the+ diffference+between+/801+and+/802&source=bl&ots=LU-EBDNE8_&sig=NFO7Pn8ju3pzB23xmdbsbBhIYI&hl=en&sa=X&ved=0ahUKEwjlrN3JytnYAhVE2KQKHbpRA2AQ6AEINTAB#v=onepage&q=sap%20 hr%20what%20is%20%20the%20diffference%20between%20%2F801%20and%20%2F802&f=false