How to Get Max key figure value

I created analytic view to join VBAK VBFA and VBRK tables. I am trying to identify last invoice created for Contract in VBAK table. Currently if I have 3 invoices created for contract I get three entries in output when I look at:

VBAK-VBELN VBRK-VBELN

1                              1001

1                               1002

1                               1003

I used Left outer join. What I need is:

VBAK-VBELN VBRK-VBELN

1                               1003

What is the best way to achieve this result?

Thanks,

Nitesh