MIN aggregation in OBIEE

Question

CONTRACT_NUM
INVOICE DATE
INVOICE AMOUNT
001
3/6/12
504.75
4/22/13
504.75
022
6/19/13
571.98
7/1/13
571.98
013
8/5/13
571.98
I am having an issue with a report similar to the tabular one above. I am trying to get the report to look like the one below:
CONTRACT_NUM
INVOICE DATE
INVOICE AMOUNT
001
3/6/12
504.75
022
6/19/13
571.98
013
8/5/13
571.98
We use OBIEE 10g and in the Invoice date (fx) I tried putting in MIN( INVOICE DATE BY CONTRACT_NUM)  and it gives the correct Invoice dates, but it doubles the invoice amount for Contract #s 001 and 022. Contract 001 was cancelled and was not reissued to the vendor. Contract 022 was cancelled on 7/1/13 and reissued under new terms to the vendor on 8/5/13. To cancel a contract we write a new invoice that counters the original invoice hence the two invoice dates for contracts 001 and 022.
The users are requiring a report that ONLY shows the original invoice date and amount.
Any help would be greatly appreciated,
Thank you.

Answer 1

Can you send bi generated query for my suggestion?
It would be nice follow-up on same post instead of opening new one... that would be like YOU are ignoring all who ever responded to that post.. and that would result ignoring YOU to respond and your post with no suggestions
have fun