diff --git a/library/L1CTL_Types.ttcn b/library/L1CTL_Types.ttcn
index 95e935fe5..66e7b9da4 100644
--- a/library/L1CTL_Types.ttcn
+++ b/library/L1CTL_Types.ttcn
@@ -478,8 +478,8 @@ module L1CTL_Types {
 			imm_ass := {
 				ded_or_tbf := ?,
 				page_mode := ?,
-				chan_desc := ?,
-				pkt_chan_desc := omit,
+				chan_desc := *,
+				pkt_chan_desc := *,
 				req_ref := f_compute_ReqRef(ra, fn),
 				timing_advance := ?,
 				mobile_allocation := ?