How to display unique documents in a notes view?

I have a notes view which has many duplicate documents, the duplicated documents have the same key such as Product Number (ProdNo in design). Now I want to only display the documents which have different Product Number, in other words, to filter out duplicated documents with the same product number. Does anybody know how to make it working? thanks a lot.

Subject: Responded to in the other forum where you posted the question.

Subject: Carl I have the same question, what other forum please?

Subject: This is why people shouldn’t post the same question to multiple forums.

Here’s a link