msc: Fix CommonId expectancies on subscr from A iface

When back on the A interface, the subscriber should no longer contain a
Last Eutran PLMN Id related entry in the VLR, since the SGs association
is no longer alive.

Related: SYS#5337
Change-Id: I8c72eaa4d41b8523f483ac3a343b782d1ef7c937
diff --git a/msc/MSC_Tests.ttcn b/msc/MSC_Tests.ttcn
index 00fc4e9..0d95c61 100644
--- a/msc/MSC_Tests.ttcn
+++ b/msc/MSC_Tests.ttcn
@@ -4543,6 +4543,11 @@
 private function f_sgsap_bssmap_screening()  runs on BSC_ConnHdlr {
 	var SmsParameters spars := valueof(t_SmsPars);
 
+	/* From now on, since we initiated LU from A-Interface, we expect no
+	 * LastEutranPLMNId on Common Id, since the SGs interface should be gone
+	 */
+	g_pars.common_id_last_eutran_plmn := omit;
+
 	/* Perform a location update, the SGs association is expected to fall
 	 * back to NULL */
 	f_perform_lu();