LV_P1 = '1.999'.

    CALL FUNCTION 'ROUND'

      EXPORTING

        DECIMALS = 0

        INPUT    = LV_P1

       SIGN     = '-'

      IMPORTING

        OUTPUT   = LV_P1.

*

*                     CALL FUNCTION 'HR_NZ_ROUNDING_DECIMALS'

*                     EXPORTING

*                       value_in                 = LV_P1

*                       conv_dec                 = 0      " 设置保留几位小数

*                     IMPORTING

*                       value_out                = LV_P1

*                     EXCEPTIONS

*                       no_rounding_required     = 1

*                       decimals_greater_than_10 = 2

*                       rounding_error           = 3

*                       OTHERS                   = 4.