4.03.05. An architect shall neither solicit nor accept a mandate from a client if he knows or has reason to believe that such client has retained the services of a colleague for the same purpose. However, if the client notifies him in writing that the mandate of his colleague has terminated, he may accept the mandate after having informed his colleague in writing of his intention.
R.R.Q., 1981, c. A-21, r. 3, s. 4.03.05.