pcu: Fix PCU_Tests_SNS.TC_sns_so_bvc_reset_unknown_bvci

All BSS-originated BVC-Reset for PTP BVC must contain a Cell Identifier.
This test is not respecting that rule

libosmogb correctly detects this and discards the RESET, which is not
what is intended here:

20210305120722368 DLBSSGP ERROR BSSGP BVCI=1235 Rx RESET missing mandatory IE (gprs_bssgp.c:392)

Change-Id: I57ebfc50befc47d0690021d73b52c504f0df4f9a
Related: OS#3879
Fixes: Iea5519b453dd544c5a78b3b16ddb5132d20cf67c
diff --git a/pcu/PCU_Tests_SNS.ttcn b/pcu/PCU_Tests_SNS.ttcn
index 34aec72..b63b51e 100644
--- a/pcu/PCU_Tests_SNS.ttcn
+++ b/pcu/PCU_Tests_SNS.ttcn
@@ -278,8 +278,10 @@
 	f_ns_exp(pdu);
 
 	/* Send a BVC-RESET on the wrong BVC */
-	var PDU_BSSGP bssgp_tx := valueof(ts_BVC_RESET(BSSGP_CAUSE_NET_SV_CAP_MOD_GT_ZERO_KBPS, mp_gb_cfg.bvc[0].bvci + 1,
-						       omit));
+	var BssgpCellId cell_id := mp_gb_cfg.bvc[0].cell_id;
+	cell_id.cell_id := cell_id.cell_id + 1;
+	var PDU_BSSGP bssgp_tx := valueof(ts_BVC_RESET(BSSGP_CAUSE_NET_SV_CAP_MOD_GT_ZERO_KBPS,
+							mp_gb_cfg.bvc[0].bvci + 1, cell_id));
 	NSCP[0].send(ts_NS_UNITDATA(t_SduCtrlB, 0, enc_PDU_BSSGP(bssgp_tx)));
 	NSCP[0].receive(tr_NS_UNITDATA(t_SduCtrlB, 0, decmatch tr_BSSGP_STATUS(mp_gb_cfg.bvc[0].bvci + 1, BSSGP_CAUSE_BVCI_UNKNOWN, *)));
 	setverdict(pass);