library: GTPv1C: make ts_GTPC_SGSNContextAck more compact

Change-Id: I9b0c948f295fd73fad79c8d09b45fd992c90a015
diff --git a/library/GTPv1C_Templates.ttcn b/library/GTPv1C_Templates.ttcn
index dcb8e60..0dc30be 100644
--- a/library/GTPv1C_Templates.ttcn
+++ b/library/GTPv1C_Templates.ttcn
@@ -1360,8 +1360,9 @@
 			private_extension_gtpc := omit
 		}
 	}
+
 	template (value) Gtp1cUnitdata ts_GTPC_SGSNContextAck(Gtp1cPeer peer, OCT4 teid, uint16_t seq,
-							      template (value) GTPC_PDUs SGSNContextAckPDU := ts_SGSNContextAckPDU(GTP_CAUSE_REQUEST_ACCEPTED)) := {
+							      template (value) GTPC_PDUs SGSNContextAckPDU := ts_SGSNContextAckPDU) := {
 		peer := peer,
 		gtpc := ts_GTP1C_PDU(sgsnContextAcknowledge, teid, valueof(SGSNContextAckPDU), seq)
 	}