diff --git a/library/Osmocom_Gb_Types.ttcn b/library/Osmocom_Gb_Types.ttcn
index 9065097..9e4d702 100644
--- a/library/Osmocom_Gb_Types.ttcn
+++ b/library/Osmocom_Gb_Types.ttcn
@@ -14,6 +14,8 @@
 	type uint16_t Nsei;
 	type uint16_t BssgpBvci;
 
+	template (present) BssgpBvci t_BssgpBvciUser := complement (0);
+
 	/* TS 48.016 10.3.7 */
 	type enumerated NsPduType {
 		NS_PDUT_NS_UNITDATA	('00000000'B),
@@ -407,6 +409,14 @@
 			nS_SDU := sdu
 		}
 	}
+	template PDU_NS tr_NS_UNITDATA_User(template NS_SDU_ControlBits bits, template octetstring sdu) := {
+		pDU_NS_Unitdata := {
+			nsPduType := '00'O,
+			nS_SDU_ControlBits := bits,
+			bVCI := complement ('0000'O),
+			nS_SDU := sdu
+		}
+	}