diff --git a/bsc/MSC_ConnectionHandler.ttcn b/bsc/MSC_ConnectionHandler.ttcn
index 225e86b8a..084676284 100644
--- a/bsc/MSC_ConnectionHandler.ttcn
+++ b/bsc/MSC_ConnectionHandler.ttcn
@@ -742,10 +742,12 @@ function f_ass_patch_lcls(inout template (omit) PDU_BSSAP ass_tpl,
 	if (ispresent(g_pars.lcls.csc)) {
 		ass_tpl.pdu.bssmap.assignmentRequest.lCLS_ConnectionStatusControl := ts_BSSMAP_IE_LclsCsc(g_pars.lcls.csc);
 	}
-	if (ispresent(g_pars.lcls.exp_sts)) {
-		ass_cpl.pdu.bssmap.assignmentComplete.lCLS_BSS_Status := tr_BSSMAP_IE_LclsSts(g_pars.lcls.exp_sts);
-	} else {
-		ass_cpl.pdu.bssmap.assignmentComplete.lCLS_BSS_Status := omit;
+	if (ischosen(ass_cpl.pdu.bssmap.assignmentComplete)) {
+		if (ispresent(g_pars.lcls.exp_sts)) {
+			ass_cpl.pdu.bssmap.assignmentComplete.lCLS_BSS_Status := tr_BSSMAP_IE_LclsSts(g_pars.lcls.exp_sts);
+		} else {
+			ass_cpl.pdu.bssmap.assignmentComplete.lCLS_BSS_Status := omit;
+		}
 	}
 }