Increase the number of manual assignment condition selection

RANGES: S_BUDAT FOR AFRU-BUDAT.
PARAMETERS:    P_RPMAX(6) TYPE N DEFAULT SY-DATUM+0(6)
  CONCATENATE P_RPMAX '01' INTO G_FIRST.
  CALL FUNCTION 'DATE_GET_MONTH_LASTDAY'
    EXPORTING
      I_DATE = G_FIRST
    IMPORTING
      E_DATE = G_LAST.

  CLEAR S_BUDAT.
  S_BUDAT -SIGN = ' I ' .
  S_BUDAT -OPTION = ' BT ' .
  S_BUDAT-LOW = G_FIRST.
  S_BUDAT -HIGH = G_LAST.
  APPEND S_BUDAT.

Screen using a fixed month selected, the program was again alone assignment early date to the end of the month.