update instanc code unique receipt bill and sale item

app/views/settings/menu_item_instances/_form.html.erb

@@ -3,11 +3,22 @@
     <div class="card">
       <div class="body">
         <%= simple_form_for([:settings,@item, @settings_menu_item_instances]) do |f| %>
-        <%= f.error_notification %>
+        <% if(flash["instance_code_error"]) %>
+          <div class="alert alert-danger">Please review the problems below:</div>
+        <% end %>
 
         <div class="col-md- panel">
           <div class="form-group p-l-15">
-            <%= f.input :item_instance_code %>
+            <%= f.input :item_instance_code ,:input_html=>{:class=>""},:required=>true  %>
+            
+            <% flash.each do |test, msg| %>
+              <% str="[\"#{msg['item_instance_code']}\"]"
+                 str.gsub!('["', '')
+                 str.gsub!('"]', '')
+              %>
+              <span class="help-block"><%= str %></span>
+            <% end %>
+
             <%= f.input :item_instance_name %>
             <%= f.input :price %>