a 1,2-diacyl-sn-glycero-3-phosphate(out) + a 1,2-diacyl-sn-glycero-3-phospho-(1D-myo-inositol)(in) = a 1,2-diacyl-sn-glycero-3-phosphate(in) + a 1,2-diacyl-sn-glycero-3-phospho-(1D-myo-inositol)(out) — reaction