Assign multiple contacts and accounts to an opportunity

Hi,

I would like to assign to an opportunity 2 or 3 contacts (and their accounts if existing). The best solution I found is using n:n relations between opportunity/contacts and opportunity/accounts. With this solution (+ subgrids in contacts and accounts forms) I can see the opportunity linked to my contacts and accounts.

However, with this solution I can't edit repports (for example : opportunity in progress per account).

Do you have an idea how I can manage this?

Thx a lot for your help !