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diff --git a/lib/asn1/src/asn1rtt_ext.erl b/lib/asn1/src/asn1rtt_ext.erl
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+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2012-2013. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%%
+%% %CopyrightEnd%
+%%
+
+-module(asn1rtt_ext).
+-export([transform_to_EXTERNAL1990/1,transform_to_EXTERNAL1994/1]).
+
+transform_to_EXTERNAL1990({_,_,_,_}=Val) ->
+    transform_to_EXTERNAL1990(tuple_to_list(Val), []);
+transform_to_EXTERNAL1990(Val) when is_tuple(Val) ->
+    %% Data already in ASN1 1990 format
+    Val.
+
+transform_to_EXTERNAL1990(['EXTERNAL'|Rest], Acc) ->
+    transform_to_EXTERNAL1990(Rest, ['EXTERNAL'|Acc]);
+transform_to_EXTERNAL1990([{syntax,Syntax}|Rest], Acc) ->
+    transform_to_EXTERNAL1990(Rest, [asn1_NOVALUE,Syntax|Acc]);
+transform_to_EXTERNAL1990([{'presentation-context-id',PCid}|Rest], Acc) ->
+    transform_to_EXTERNAL1990(Rest, [PCid,asn1_NOVALUE|Acc]);
+transform_to_EXTERNAL1990([{'context-negotiation',Context_negot}|Rest], Acc) ->
+    {_,Presentation_Cid,Transfer_syntax} = Context_negot,
+    transform_to_EXTERNAL1990(Rest, [Presentation_Cid,Transfer_syntax|Acc]);
+transform_to_EXTERNAL1990([asn1_NOVALUE|Rest], Acc) ->
+    transform_to_EXTERNAL1990(Rest, [asn1_NOVALUE|Acc]);
+transform_to_EXTERNAL1990([Data_val_desc,Data_value], Acc)
+  when is_list(Data_value)->
+    list_to_tuple(lists:reverse([{'octet-aligned',Data_value},
+				 Data_val_desc|Acc]));
+transform_to_EXTERNAL1990([Data_val_desc,Data_value], Acc)
+  when is_binary(Data_value) ->
+    list_to_tuple(lists:reverse([{'single-ASN1-type',Data_value},
+				 Data_val_desc|Acc]));
+transform_to_EXTERNAL1990([Data_value], Acc)
+  when is_list(Data_value); is_binary(Data_value) ->
+    list_to_tuple(lists:reverse([{'octet-aligned',Data_value}|Acc])).
+
+
+transform_to_EXTERNAL1994({'EXTERNAL',DRef,IndRef,Data_v_desc,Encoding}=V) ->
+    Identification =
+	case {DRef,IndRef} of
+	    {DRef,asn1_NOVALUE} ->
+		{syntax,DRef};
+	    {asn1_NOVALUE,IndRef} ->
+		{'presentation-context-id',IndRef};
+	     _ ->
+		{'context-negotiation',
+		 {'EXTERNAL_identification_context-negotiation',IndRef,DRef}}
+	end,
+    case Encoding of
+	{'octet-aligned',Val} when is_list(Val); is_binary(Val) ->
+	    %% Transform to the EXTERNAL 1994 definition.
+	    {'EXTERNAL',Identification,Data_v_desc,Val};
+	_  ->
+	    %% Keep the EXTERNAL 1990 definition to avoid losing
+	    %% information.
+	    V
+    end.