A technique facilitates downhole service operations including cementing operations. A retrievable cementing bushing is designed to facilitate the service operation and includes a body on which is mounted an engagement lug. The engagement lug is mounted for movement in a radial direction and includes an outer engagement feature and an inner engagement feature. The inner engagement feature is oriented for cooperation with a slick joint. The engagement lug is biased in a radially outward direction for engagement with corresponding features of a surrounding wall.