diff --git a/stp/STP_Tests_M3UA.ttcn b/stp/STP_Tests_M3UA.ttcn
index dfa82a2..0bc398d 100644
--- a/stp/STP_Tests_M3UA.ttcn
+++ b/stp/STP_Tests_M3UA.ttcn
@@ -615,11 +615,23 @@
 	f_clear_m3ua();
 }
 
-/* try to de-register a routing key that was registered -> OK*/
+/* try to de-register a routing key that was registered -> OK */
 testcase TC_rkm_unreg_registered() runs on RAW_M3UA_CT {
+	var OCT3 dpc := int2oct(123, 3);
+	var OCT4 rctx := int2oct(1234, 4);
+
+	f_init_common();
+	f_vty_config2(VTY, {"cs7 instance 0"}, "xua rkm routing-key-allocation dynamic-permitted");
 	f_init_m3ua();
-	f_M3UA_send(0, ts_M3UA_DEREG_REQ(ts_M3UA_routing_ctx(int2oct(mp_m3ua_configs[0].routing_ctx,4))));
+
+	/* first register the routing key */
+	f_M3UA_rkm_register(id:='30000099'O, dpc:=dpc, rctx:=rctx);
+
+	/* then try to de-register */
+	f_M3UA_send(0, ts_M3UA_DEREG_REQ(ts_M3UA_routing_ctx(rctx)));
 	f_M3UA_exp(0, tr_M3UA_DEREG_RSP({tr_M3UA_dereg_res(?,c_m3UA_DEREGSTS_SUCCESS)}));
+
+	f_vty_config2(VTY, {"cs7 instance 0"}, "xua rkm routing-key-allocation static-only");
 	f_clear_m3ua();
 }