Hi, I extremely need your help. Can you suggest me some links or give a piece of advice about how can I add a such a functionality to the "Add exsisting entity name" button. I have a custom Contract entity which connected with the Opportunity with N:N relationship. Now I want to do something like this: when I cklick to the "Add existing contract" button I need to get only filtered contracts (the list of a contract where the customer is the same CustomerId from the opportunity).
Thanks in advance!