使用连接重复值

Question

第一张图片显示Paid_Amount第2行和第3行的结果，重复付费金额，同时付费1 image 1

第二张图片显示Paid_Amount仅存在一次image 2

我正在使用以下查询，付费表中只存在一条记录虽然重复3次，请帮我找出正确的结果。

SELECT 
    SUM(totalAmount) as TotalSum,
    T_VISIT.dateVisit as Visit,
    T_AMOUNT.amountType as Amount_Type,
    (CASE 
        WHEN T_PAID_AMT_PT.paidAmt IS NOT NULL 
            THEN T_PAID_AMT_PT.paidAmt 
        ELSE 0 END) as Paid_Amount,
    (T_PAID_AMT_PT.paidAmt - SUM(totalAmount)) as Balance 
FROM tblPatientAmountDetails T_AMOUNT 
    INNER JOIN tblVisitDetailsPt T_VISIT 
        ON T_AMOUNT.visitId = T_VISIT.visitId
    INNER JOIN  tblPaidAmountPt T_PAID_AMT_PT 
        ON T_PAID_AMT_PT.visitId = T_VISIT.visitId  
WHERE T_VISIT.regNo = 'OPD0002'  
GROUP BY 
    T_VISIT.dateVisit,
    T_AMOUNT.amountType,
    T_PAID_AMT_PT.paidAmt,
    T_PAID_AMT_PT.balence