Is requesting to see the Prophet Muhammad (peace be upon him) in a dream, and requesting advice from him, considered an transgression in supplication?

Seeing the Prophet (peace be upon him) in a dream is permissible and true, because Satan cannot imitate him. There is no harm in asking Allah to see him in a dream. It is stipulated for anyone who claims to have seen him that his image must conform to the descriptions narrated about him (peace be upon him), because Satan might appear in another form, deceiving one into believing it is him.