Catalyzes the transfer of phosphatidylinositol (PI) and phosphatidic acid (PA) between membranes (PubMed:22822086). May control phosphatidylinositol concentration in transport vesicles from the subrhabdomeric cisternae (SRC) to the rhabdomere (PubMed:1903119). May function as a calcium transporter (PubMed:1903119). a 1,2-diacyl-sn-glycero-3-phospho-(1D-myo-inositol)(in) = a 1,2-diacyl-sn-glycero-3-phospho-(1D-myo-inositol)(out) a 1,2-diacyl-sn-glycero-3-phosphate(in) = a 1,2-diacyl-sn-glycero-3-phosphate(out) Expressed in adult heads, not detected in bodies. Flies exhibit rapid light-induced retinal degeneration. Belongs to the PtdIns transfer protein family. PI transfer class IIA subfamily. Intron retention.