Unexpected results on JOIN

[webartus]

I am struggling to get Cognos to work the way I want it to. Here is my info:

ID
NAME
PRIZE = '2' AND [PRIZE_AMOUNT] is not null and [PRIZE_AMOUNT] > 0
PRIZE <> '5'
PRIZE_AMOUNT
FIELD_81 is not null
NOTIFICATION <> 'CURRENT'

Each customer can have multiple notifications. If the customer has received 'CURRENT' notification, they should be excluded from the list even if they have other notifications. If the customer has received PRIZE = '5' then they should be excluded from the list even if they have PRIZE='2' or any other PRIZE.

I have tried several approaches but cannot get the result that I am looking for. Any help/suggestions you brilliant folks can offer would be much appreciated.