class Shop < ActiveRecord::Base
  has_many :documents
  validates :name, :presence => true
  accepts_nested_attributes_for :documents

class Document < ActiveRecord::Base
  belongs_to :shop
  validates :reference_number, :presence => true

The partial _form for shop is:

- @shop.documents.build
= simple_form_for(@shop) do |shop_f|
  = render 'shared/error_messages', :object => @shop

  = render :partial => 'documents/form', :locals => { :form => shop_f }

  = field_set_tag t('shop') do
    .inputs
      = shop_f.input :role_number
      = shop_f.input :role_date
      = shop_f.input :name

the partial _form for document is:

= form.simple_fields_for :documents do |document_f|
  = field_set_tag t('document') do
    .inputs
      = document_f.input :reference_number

When I submit the form with no values in shop name or document
reference_number I have the errors messages and it is correct but in
the page I have the shop form with two document form.
Why the two document forms?
Sorry for my bad english hope my problem is clear.

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