判断变量是否为数字的方法

        TRY.
            TRANSLATE l_intern-value TO UPPER CASE.
            IF l_intern-value EQ 'SPACE'.
              itab-aplfz = 999.
            ELSE.
              MOVE l_intern-value TO itab-aplfz.    " 计划交货天数
            ENDIF.
          CATCH cx_sy_conversion_no_number.
            itab-aplfz = 999.
        ENDTRY.