Our organization is a matrix organization with very little power in PM hands. PM themselves are subject matter experts who share PM roles on one projects with delivery on others. We recently started having one group of sales people interfering into the project management process. for example, they try to schedule meetings without confirming it or informing the assigned PM. The latest news is: they are selling the project, and saying to the client that an account manager will perform the project management, so the project will be "cheaper". I do not get the "cheaper" logic, but I try to find information on why it is a very bad idea. We are not a mature organization, where everything is established and roles and responsibilities are clearly defined, so this kind of situations are hard to argue with, after it was "sold" this way. I will appreciate any advice or point into a right direction on who should be doing what and why in PM- sales person interaction. Thank you!
I do not get the "cheaper" logic, but I try to find information on why it is a very bad idea.
The "cheaper" logic is obvious: if you need no PM, you don't need to pay a PM and the project will be cheaper.
It's a bad idea because managing a project is a job. It's not something you take on as a hobby after hours in your sales job. That's not exactly unique to project management. Every job worth doing is worth doing properly.
But this is a management thing. Your company needs to set guidelines how projects are done. Does every project need a PM? Only your company can decide that.
Roles and responsibilities exist in organization regardless of its maturity level. Different games have different rules, but each game has its rules. What you encounter now is someone breaking the rules. What do you do when you see someone breaking the rules? You call the police or, speaking of company affairs, your boss. I assume that you are not a department manager (the one who actually can change the rules).
Express the situation to your manager in open and judgement-free manner. Tell about your assumptions who is responsible for what. Explain specific cases which contradicts with your assumptions. Ask to provide resolutions for each (do not make any proposals if you are emotional about the topic). If your activities depend on those resolutions - mention that you have to stop corresponding tasks until then.