pcu: TC_bssgp_dl_unitdata_with_invalid_imsi: Expect BSSGP STATUS on correct port

Change-Id: I0457302fef24a362f0720247ea653b06af9e1c87
diff --git a/pcu/PCU_Tests.ttcn b/pcu/PCU_Tests.ttcn
index 1d6349d..4204139 100644
--- a/pcu/PCU_Tests.ttcn
+++ b/pcu/PCU_Tests.ttcn
@@ -2644,7 +2644,7 @@
 	/* Now SGSN sends some DL data with an invalid IMSI */
 	BSSGP[0].send(ts_BSSGP_DL_UD(ms.tlli, data, imsi := ts_BSSGP_IMSI('1122'H)));
 
-	BSSGP_SIG[0].receive(tr_BSSGP_STATUS(omit, BSSGP_CAUSE_CONDITIONAL_IE_ERROR, ?));
+	BSSGP_GLOBAL[0].receive(tr_BSSGP_STATUS(omit, BSSGP_CAUSE_CONDITIONAL_IE_ERROR, ?));
 
 	/* TODO: make sure no data is sent over PCU -> MS */