hnbgw: Fix encoding of AssignmentRequest with RABs to be released

Also change the name to avoid mistaking it for a RABReleaseRequest

Change-Id: Ifb52ed9e5559e9566b0d7a02246fdf29ff0b6dce
diff --git a/hnbgw/HNBGW_Tests.ttcn b/hnbgw/HNBGW_Tests.ttcn
index aea7de8..959fe87 100644
--- a/hnbgw/HNBGW_Tests.ttcn
+++ b/hnbgw/HNBGW_Tests.ttcn
@@ -901,7 +901,7 @@
 	f_create_rab(pars.mgcp_pars);
 
 	/* Send RAB Release */
-	tx := valueof(ts_RANAP_RabReleaseReq(ts_RAB_RL(t_RAB_id(23), ts_RanapCause_om_intervention)));
+	tx := valueof(ts_RANAP_RabAssignmentReqRabRel(ts_RAB_RL(t_RAB_id(23), ts_RanapCause_om_intervention)));
 	BSSAP.send(tx);
 
 	T.start;