diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index a9cfa03..f2f7f5b 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -5656,10 +5656,9 @@
 	f_shutdown_helper();
 }
 
-
 /* 24.008 8.4 Unknown message must trigger RR STATUS */
 private function f_tc_err_84_unknown_msg(charstring id) runs on MSC_ConnHdlr {
-	f_est_single_l3(ts_RRM_UL_REL('00'O));
+	f_est_single_l3(ts_RRM_DTM_ASS_FAIL('00'O));
 	timer T := 3.0
 	alt {
 	[] RSL.receive(tr_RSL_DATA_REQ(g_chan_nr, ?, decmatch tr_RRM_RR_STATUS)) {
diff --git a/library/L3_Templates.ttcn b/library/L3_Templates.ttcn
index edec440..345935c 100644
--- a/library/L3_Templates.ttcn
+++ b/library/L3_Templates.ttcn
@@ -1012,6 +1012,23 @@
 	}
 }
 
+template (value) PDU_ML3_MS_NW ts_RRM_DTM_ASS_FAIL(OCT1 cause) := {
+	discriminator := '0110'B,
+	tiOrSkip := {
+		skipIndicator := '0000'B
+	},
+	msgs := {
+		rrm := {
+			dTM_AssignmentFailure := {
+				messageType := '01001000'B,
+				rR_Cause := {
+					valuePart := cause
+				}
+			}
+		}
+	}
+}
+
 template PDU_ML3_MS_NW tr_RRM_RR_STATUS(template OCT1 cause := ?) := {
 	discriminator := '0110'B,
 	tiOrSkip := {