Proof using overlay_map_congr name_map_bijective multi_map_congr fail_msg_map_congr.
move => net failed tr H_step.
remember step_ordered_failure_init as y in *.
have H_eq_f: failed = fst (failed, net) by [].
have H_eq_n: net = snd (failed, net) by [].
rewrite H_eq_f {H_eq_f}.
rewrite {2}H_eq_n {H_eq_n}.
move: Heqy.
induction H_step using refl_trans_1n_trace_n1_ind => H_init /=.
rewrite H_init.
rewrite /step_ordered_failure_init /= /pt_map_onet /=.
rewrite -pt_init_handlers_fun_eq.
exact: RT1nTBase.
concludes.
rewrite H_init {H_init x} in H_step2 H_step1.
case: x' H IHH_step1 H_step1 => failed' net'.
case: x'' H_step2 => failed'' net''.
rewrite /=.
move => H_step2 H IHH_step1 H_step1.
apply step_ordered_failure_pt_mapped_simulation_1 in H.
rewrite filterMap_app.
case: H => H.
have H_trans := refl_trans_1n_trace_trans IHH_step1.
apply: H_trans.
rewrite (app_nil_end (filterMap pt_map_trace_ev _)).
apply: (@RT1nTStep _ _ _ _ (map tot_map_name failed'', pt_map_onet net'')) => //.
exact: RT1nTBase.
move: H => [H_eq_n [H_eq_f H_eq]].
by rewrite H_eq_n -H_eq_f H_eq -app_nil_end.
Qed.
Context {new_msg_fst : NewMsgParams multi_fst}.
Context {new_msg_snd : NewMsgParams multi_snd}.
Context {new_msg_map_congr : NewMsgParamsPartialMapCongruency new_msg_fst new_msg_snd msg_map}.
Definition pt_map_odnet (net : @ordered_dynamic_network _ multi_fst) : @ordered_dynamic_network _ multi_snd :=
{| odnwNodes := map tot_map_name net.(odnwNodes) ;
odnwPackets := fun src dst => filterMap pt_map_msg (net.(odnwPackets) (tot_map_name_inv src) (tot_map_name_inv dst)) ;
odnwState := fun n => match net.(odnwState) (tot_map_name_inv n) with
| None => None
| Some d => Some (pt_map_data d)
end |}.

Lemma collate_ls_pt_map_eq :
forall ns f h m m',
pt_map_msg m = Some m' ->
(fun src dst => filterMap pt_map_msg (collate_ls name_eq_dec ns f h m (tot_map_name_inv src) (tot_map_name_inv dst))) =
collate_ls name_eq_dec (map tot_map_name ns) (fun src dst => filterMap pt_map_msg (f (tot_map_name_inv src) (tot_map_name_inv dst))) (tot_map_name h) m'.