diff --git a/library/RAN_Emulation.ttcnpp b/library/RAN_Emulation.ttcnpp
index 295876e..d87ee9c 100644
--- a/library/RAN_Emulation.ttcnpp
+++ b/library/RAN_Emulation.ttcnpp
@@ -439,9 +439,9 @@
 type record BSSAP_Conn_Req {
 	SCCP_PAR_Address	addr_peer,
 	SCCP_PAR_Address	addr_own,
-	PDU_BSSAP		bssap
+	PDU_BSSAP		bssap optional
 }
-template BSSAP_Conn_Req ts_BSSAP_Conn_Req(SCCP_PAR_Address peer, SCCP_PAR_Address own, PDU_BSSAP bssap) := {
+template BSSAP_Conn_Req ts_BSSAP_Conn_Req(SCCP_PAR_Address peer, SCCP_PAR_Address own, template (omit) PDU_BSSAP bssap) := {
 	addr_peer := peer,
 	addr_own := own,
 	bssap := bssap