title: Acumatica - error when customizing "Marketing Campaign" screen
body: <p>I am having the following error when adding any custom field or overriding any attribute on existing fields on Marketing Campaign screen:</p>
  
  <pre><code>\App_RuntimeCode\PX_Objects_CR_CRCampaign_extensions.cs(1): error CS0246: The type or namespace name 'AP' could not be found (are you missing a using directive or an assembly reference?)
  </code></pre>
  
  <p>Any idea on where to track this error?</p>