BTS_Tests: fix f_TC_imm_ass(): use send template, not receive one

  BTS_Tests.ttcn:3647.9-3703.1: In function definition `f_TC_imm_ass':
    BTS_Tests.ttcn:3661.37-99: In the operand of operation `valueof()':
      BTS_Tests.ttcn:3661.58-98: In actual parameter list of template
                                 `@GSM_RR_Types.ts_ChanDescH0':
        GSM_Types.ttcn:125.48-55: warning: Inadequate restriction on
                                  the referenced template parameter
                                  `sub_slot', this may cause a dynamic
                                  test case error at runtime
        GSM_Types.ttcn:126.8-9: warning: Inadequate restriction on
                                the referenced template parameter
                                `tn', this may cause a dynamic test
                                case error at runtime

Change-Id: I7d36d25e5f8d3bb1040c737eeaeddd15f98ec4c2
diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index ae2d2e0..aa06180 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -3566,7 +3566,7 @@
 	f_l1_tune(L1CTL);
 
 	for (var integer i := 0; i < num_total; i := i+1) {
-		var ChannelDescription ch_desc := valueof(ts_ChanDescH0(t_RslChanNr_SDCCH4(0, 0), mp_trx0_arfcn));
+		var ChannelDescription ch_desc := valueof(ts_ChanDescH0(ts_RslChanNr_SDCCH4(0, 0), mp_trx0_arfcn));
 		var GsmRrMessage ia := valueof(ts_IMM_ASS(42, i, 5, ch_desc, c_MA_null));
 		var octetstring ia_enc := enc_GsmRrMessage(ia);
 		RSL_CCHAN.send(ts_ASP_RSL_UD(ts_RSL_IMM_ASSIGN(ia_enc, 0)));