Hi Ramesh,
Make use of FM 'HR_INFOTYPE_OPERATION' to modify record. First lock the employee and then make changes, after that unlock that pernr.
Read the infotype 1 record which needs to be modified and pass it into work area 'wa_P0001'.
CALL FUNCTION 'BAPI_EMPLOYEE_ENQUEUE'
EXPORTING
NUMBER = wa_P0001-PERNR.
CALL FUNCTION 'HR_INFOTYPE_OPERATION'
EXPORTING
INFTY = '0001'
NUMBER = wa_P0001-PERNR
VALIDITYEND = wa_P0001-ENDDA
VALIDITYBEGIN = wa_P0001-BEGDA
RECORD = wa_P0001
OPERATION = 'MOD'
TCLAS = 'A'
IMPORTING
RETURN = wa_return.
COMMIT WORK.
CALL FUNCTION 'BAPI_EMPLOYEE_DEQUEUE'
EXPORTING
NUMBER = wa_P0001-PERNR.