According to SAP the execution of the balance carry forward programs represents the closure of the year. The G/L balance carry forward program does not make any postings. It calculates the net operating profit to the Retained Earnings Account and transfers the balances to period 0 of the next fiscal year. For countries that need to do closing and opening postings (hard closure) SAP provides the program RFSUMB00 (or if the new General Ledger is in use program FAGL_YEC_POSTINGS).
Understand more about using RFSUMB00 for Year End Closing.