Rails - Jun 2008 - Form object suddenly can't read my routes?

I''m building a large application where I do everything exactly the
same across most controllers and views. All of them have worked so far
but now, I''m geting the strangest behaviour out of one. I am calling
the same _form.html.erb that fails on either the new or edit action.
I am certain my routes are built correctly but I seem to receive a
message when I''m invoking the form object that it can''t find
the
route?

 NoMethodError in Evidence/etxcodes#edit

Showing evidence/etxcodes/edit.html.erb where line #5 raised:

undefined method `etxcode_path'' for #<ActionView::Base:0x554bc6c>

Extracted source (around line #5):

2:
3: <%= error_messages_for :etxcode %>
4:
5: <% form_for(@etxcode) do |form| %>
6:   <%= form.error_messages %>
7:
8:

Parameters:

{"account_id"=>"2",
 "id"=>"1"}

My edit method is pretty standard and is exactly like all the others

  def edit
    @title = "Edit Transaction Code for: #{@account.name}"
    if current_user.evid_auth > MAX_CONTROL
      @etxcode = @account.etxcodes.find(params[:id])
    else
      flash[:notice] = "You are not authorized to perform this task"
      redirect_back_or_default account_etxcodes_path(@account)
      return false
    end
  end

Actually the functional route that the form object should be using is
edit_account_etxcode_path(@account, @etxcode).
Could anyone recommend how they''d this curious problem?
Thank you,
Kathleen

P.S. All these other routes work correctly;
  map.resources :accounts,         :controller =>
''admin/accounts'' do |
account|
    account.resources   :agencies,       :name_prefix =>
"account_",       :controller =>
''evidence/agencies''
    account.resources   :incidents,      :name_prefix =>
"account_",       :controller =>
''evidence/incidents''
    account.resources   :ecategories,    :name_prefix =>
"account_",       :controller =>
''evidence/ecategories''
    account.resources   :etxcodes,       :name_prefix =>
"account_",       :controller =>
''evidence/etxcodes''
    account.resources   :ecases,         :name_prefix =>
"account_",       :controller =>
''evidence/ecases''
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