HELP - Query Join Problem

Question

I am trying to write a query to return data from 4 different tables and it is doubling my summed values. I can get the separate queries to work, but not combined and I need them combined so that I can get a balance due and limit the records to only those that had a total billed (fees) less than $200.
Query #1 Gets the total of the fees due for each appeal type and invoice:
Note: There is always at least one fee attached to an invoice.
SELECT APT.APTY_DESCR "APPEAL TYPE",
INV.INVC_ID_SEQ INVOICE,
SUM( ALL FEE.AMT_DUE) "TOTAL BILLED AMOUNT"
FROM WRD_APPEALS AP,
WRD_INVOICES INV,
WRD_FEES_DUE FEE,
WRD_APPEAL_TYPES APT
WHERE AP.APST_CD = 'PEND'
AND AP.INVC_ID_SEQ = INV.INVC_ID_SEQ
AND AP.INVC_ID_SEQ = FEE.INVC_ID_SEQ
AND AP.APTY_CD = APT.APTY_CD
GROUP BY APT.APTY_DESCR, INV.INVC_ID_SEQ
ORDER BY APT.APTY_DESCR, INV.INVC_ID_SEQ
4     BILLING CATEGORY INCORRECT     4147     1200
5     BILLING CATEGORY INCORRECT     4203     1100
6     BILLING CATEGORY INCORRECT     4216     72600
7     BILLING CATEGORY INCORRECT     4826     1000
8     BILLING CATEGORY INCORRECT     4951     2060
Query #2 Gets the total amount paid for each appeal type and invoice:
Note: An invoice may or may not have a payment, thus the outer join.
SELECT APT.APTY_DESCR "APPEAL TYPE",
INV.INVC_ID_SEQ INVOICE,
SUM(ALL PMT.PAID_AMT) "AMOUNT PAID"
FROM WRD_APPEALS AP,
WRD_INVOICES INV,
WRD_APPEAL_TYPES APT,
WRD_PAYMENTS PMT
WHERE AP.APST_CD = 'PEND'
AND AP.INVC_ID_SEQ = INV.INVC_ID_SEQ
AND AP.APTY_CD = APT.APTY_CD
AND INV.INVC_ID_SEQ = PMT.INVC_ID_SEQ(+)
GROUP BY APT.APTY_DESCR, INV.INVC_ID_SEQ
ORDER BY APT.APTY_DESCR, INV.INVC_ID_SEQ
4     BILLING CATEGORY INCORRECT     4147     200
5     BILLING CATEGORY INCORRECT     4203     0
6     BILLING CATEGORY INCORRECT     4216     72600
7     BILLING CATEGORY INCORRECT     4826     
8     BILLING CATEGORY INCORRECT     4951     
Combined Query - Gets all of the above as well as the balance due. Note the doubled values for some records.
SELECT APT.APTY_DESCR "APPEAL TYPE",
INV.INVC_ID_SEQ INVOICE,
SUM( ALL FEE.AMT_DUE) "TOTAL BILLED AMOUNT",
     SUM(ALL PMT.PAID_AMT) "AMOUNT PAID",
     (SUM(ALL FEE.AMT_DUE) -
     NVL2(SUM(ALL PMT.PAID_AMT), SUM(ALL PMT.PAID_AMT), 0)) "BALANCE DUE"
FROM WRD_APPEALS AP,
WRD_INVOICES INV,
WRD_FEES_DUE FEE,
WRD_APPEAL_TYPES APT,
     WRD_PAYMENTS PMT
WHERE AP.APST_CD = 'PEND'
AND AP.INVC_ID_SEQ = INV.INVC_ID_SEQ
     AND INV.INVC_ID_SEQ = PMT.INVC_ID_SEQ(+)
     AND INV.INVC_ID_SEQ = FEE.INVC_ID_SEQ
     AND AP.APTY_CD = APT.APTY_CD
GROUP BY APT.APTY_DESCR, INV.INVC_ID_SEQ
ORDER BY APT.APTY_DESCR, INV.INVC_ID_SEQ,
4     BILLING CATEGORY INCORRECT     4147     1200     400     800
5     BILLING CATEGORY INCORRECT     4203     2200     0     2200
6     BILLING CATEGORY INCORRECT     4216     72600     435600     -363000
7     BILLING CATEGORY INCORRECT     4826     1000          1000
8     BILLING CATEGORY INCORRECT     4951     2060          2060
HELP PLEASE!
Thank you.

Answer 1

When you have multiple child rows, the parent row gets returned once for each child row found. Therefore, if you have summed the invoice, it gets summed again for each payment. Perhaps this little example will help you understand the problem.
Note that I used a sub query here to obtain the desired results. Analytic functions can do the same I believe, but I am still learning them :-)
  D> DROP TABLE DMILL.invoice;
Table dropped.
  D>
  D> DROP TABLE DMILL.payments;
Table dropped.
  D>
  D> CREATE TABLE invoice AS
     SELECT 1 id, 10 amount FROM DUAL UNION ALL
     SELECT 2 id, 10  FROM DUAL UNION ALL
     SELECT 2 id, 10  FROM DUAL UNION ALL
     SELECT 3 id, 10  FROM DUAL;
Table created.
  D>
  D> CREATE TABLE payments AS
     SELECT 1 inv_id, 5 amount FROM DUAL UNION ALL
     SELECT 1 inv_id, 5 amount FROM DUAL UNION ALL
     SELECT 2 inv_id, 5 amount FROM DUAL UNION ALL
     SELECT 2 inv_id, 5 amount FROM DUAL UNION ALL
     SELECT 2 inv_id, 5 amount FROM DUAL;
Table created.
  D>
  D> select * from invoice;
        ID     AMOUNT
         1         10
         2         10
         2         10
         3         10
  D>
  D> select * from payments;
    INV_ID     AMOUNT
         1          5
         1          5
         2          5
         2          5
         2          5
  D>
  D> select id
              ,sum (amount)
      from  invoice
     group by id;
        ID SUM(AMOUNT)
         1          10
         2          20
         3          10
  D>
  D> select inv_id
              ,sum(amount)
      from  payments
     group by inv_id;
    INV_ID SUM(AMOUNT)
         1          10
         2          15
  D>
  D> select inv.id
              ,inv.amount
              ,pay.amount
      from invoice  inv
             ,payments pay
     where pay.inv_id = inv.id;
        ID     AMOUNT     AMOUNT
         1         10          5
         1         10          5
         2         10          5
         2         10          5
         2         10          5
         2         10          5
         2         10          5
         2         10          5
8 rows selected.
  D>
  D> select inv.id
              ,sum(inv.amount)
              ,sum(pay.amount)
      from invoice  inv
             ,payments pay
     where pay.inv_id = inv.id
     group by inv.id;
        ID SUM(INV.AMOUNT) SUM(PAY.AMOUNT)
         1              20              10
         2              60              30
  D>
  D> select inv.id
              ,sum(inv.amount)
              ,(SELECT sum(pay.amount)
                FROM   payments pay
                WHERE  pay.inv_id = inv.id)
      from invoice  inv
     group by inv.id;
        ID SUM(INV.AMOUNT) (SELECTSUM(PAY.AMOUNT)FROMPAYMENTSPAYWHEREPAY.INV_ID=INV.ID)
         1              10                                                           10
         2              20                                                           15
         3              10Let me know if you need further explanation.