Predicted to enable phosphatidylinositol-4-phosphate phosphatase activity. Predicted to be involved in phosphatidylinositol dephosphorylation. Predicted to be located in Golgi membrane; endoplasmic reticulum membrane; and endoplasmic reticulum-plasma membrane contact site. Predicted to be active in endoplasmic reticulum. Orthologous to human SACM1L (SAC1 like phosphatidylinositide phosphatase).