bsc: adjust to changed 'vamos modify' vty command syntax

Related: SYS#5315 OS#4940 Ibf53f4797d7491b17a33946fd7d920f038362b4c
Change-Id: I94988ee64edbecbe19c41d8cac5b055360f76547
diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index 9ea0269..2b3703f 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -8602,7 +8602,7 @@
 
 	f_establish_fully(ass_cmd, exp_compl);
 
-	f_vty_transceive(BSCVTY, "vamos modify lchan 0 0 1 0 tsc 2 3");
+	f_vty_transceive(BSCVTY, "bts 0 trx 0 timeslot 1 sub-slot 0 modify vamos tsc 2 3");
 
 	var RSL_Message rsl;