Enables ceramide phosphoethanolamine synthase activity. Acts upstream of or within ceramide biosynthetic process and ceramide phosphoethanolamine biosynthetic process. Predicted to be located in cytosol and endoplasmic reticulum. Predicted to be integral component of Golgi membrane; integral component of endoplasmic reticulum membrane; and integral component of plasma membrane. Orthologous to human SAMD8 (sterile alpha motif domain containing 8). [provided by Alliance of Genome Resources, Apr 2022]