anchor.diff:                <div class="panel panel-default">
                   <div class="panel-heading">
                     <h4 class="panel-title">
  -                    <a data-toggle="collapse" data-parent="#accordion" href="#collapseOne"><span class="fa fa-user">
  -                    </span> DATOS DEL PROVEEDOR</a>
  +                    <a data-toggle="collapse" data-parent="#accordion" href="#collapseOne"> Datos del Proveedor</a>
                     </h4>
                   </div>
                   <div id="collapseOne" class="panel-collapse collapse in">
  
positive.code:               <div class="panel panel-default">
                  <div class="panel-heading">
                    <h4 class="panel-title">
                      <a data-toggle="collapse" data-parent="#accordion" href="#collapseTwo"><span class="fa fa-barcode">
                      </span> PRODUCTOS</a>
                    </h4>
                  </div>
                  <div id="collapseTwo" class="panel-collapse collapse">
                    <div class="panel-body">
                      <div class="table-responsive" id="factura">
                        <%= f.fields_for :productos do |item_factura| %>
                        <%= render 'item_facturas/itemfacturacompra', f:item_factura %>
                        <% end %>
                        <%= f.link_to_add "Producto", :productos, :class => "nuevo_new"%>
                      </div>
                    </div>
                  </div>
                </div>
  
negative.code:                 <h4>TOTAL:</h4>
                </td>
                <td>
  
                  <%= f.text_field :subtotal_0, class: "input-noborder subtotal_0 text-right", :readonly => true%>
                  <%= f.text_field :descuento, class: "input-noborder descuento_factura text-right", :readonly => true%>
                  <%= f.text_field :subtotal_12, class: "input-noborder subtotal_12 text-right",:readonly => true%>
  