The users of my org have a needs but I don't know how to help them. In my Organization there are two objects Opportunity and P&L. Every Opportunity have one and only one P&L where the agents insert more information about the Opportunity's products. The problem is that: The users can add Opportunity's products after the P&L is created. They want an Alert that says :"P&L already exists, go and modify it."
My question is: Can I add an alert on the button "add product" that pops up only when P&L already exists?