Oracle ORA-01438:大于此列允许的指定精度的值

下面是我的代码，我不明白我做错了什么。任何帮助都将不胜感激

CREATE OR REPLACE
PROCEDURE COMP_LATE_FEE(LATE_APT_FINE IN NUMBER, LATE_GRG_FINE IN NUMBER)
AS
DIFF NUMBER;
TYPE MBCUR IS REF CURSOR RETURN MONTHLY_BILL%ROWTYPE;
MONBILL MBCUR;
MBREC MONTHLY_BILL%ROWTYPE;
BEGIN
--DIFF := FLOOR(SYSDATE - (TRUNC(SYSDATE,'MM')));
--DBMS_OUTPUT.PUT_LINE(DIFF);

OPEN MONBILL FOR
    -- checking the status of all last month's bills
    SELECT * FROM MONTHLY_BILL
    WHERE STATUS = 'PENDING' AND SYSDATE > ED_DT;
FETCH MONBILL INTO MBREC;
    -- adding the late fee amount for any bills that are past the due date
    -- due date = last day of the month
    DIFF := FLOOR(ABS(MBREC.ED_DT - (TRUNC(SYSDATE,'MM'))));
    UPDATE MONTHLY_BILL
    SET LATE_FEE = DIFF * LATE_APT_FINE
    WHERE BILL_NUM = MBREC.BILL_NUM;
    -- if a garage is rented by the resident then the respective additional fee is included
    IF (MBREC.GARAGE_RENT != 0) THEN
        UPDATE MONTHLY_BILL
        SET LATE_FEE = LATE_FEE + DIFF * LATE_GRG_FINE
        WHERE BILL_NUM = MBREC.BILL_NUM;
    END IF;

    COMMIT;
CLOSE MONBILL;
 END;
/

编译的过程没有任何错误。但是当我调用proc时，会出现以下错误

BEGIN
COMP_LATE_FEE(70,20);
END;
/

错误报告：

ORA-01438: value larger than specified precision allowed for this column
ORA-06512: at "LALLURI.COMP_LATE_FEE", line 19
ORA-06512: at line 2
01438. 00000 -  "value larger than specified precision allowed for this column"
*Cause:    When inserting or updating records, a numeric value was entered
           that exceeded the precision defined for the column.
*Action:   Enter a value that complies with the numeric column's precision,
           or use the MODIFY option with the ALTER TABLE command to expand
           the precision.

---

假设第19行的语句是

UPDATE MONTHLY_BILL
SET LATE_FEE = DIFF * LATE_APT_FINE
WHERE BILL_NUM = MBREC.BILL_NUM;

---

问题似乎是计算的结果对于

月账单

表中的

滞纳金

列而言太大。我们知道，根据传入的参数值，

late\u apt\u fine

为70。由于我们不知道发生错误时

diff

变量的值，也不知道

月账单中
滞纳金
列的定义，很难知道问题在于是否需要更改滞纳金的定义，或者计算值是否比您预期的大，算法是否需要更改。
某些中间计算的结果比var存储的结果更大。也许是这样：
LATE\u FEE=LATE\u FEE+DIFF*LATE\u GRG\u FINE
。检查变量类型。谢谢你，凯夫先生。我现在明白为什么会出现这个问题了。谢谢你花时间解释。