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I want to include a custom fields from the entry with the {related_entries} tag but it won’t render anything but the custom field name. Look at the field that says {en_caption}. That field belongs to the weblog entry and not the related entry but it seems it can’t be called.

{exp:weblog:entries weblog="test"}

<h3>{title}</h3>

<p>{body}</p>

<p>{related_entries id="images"}</p>

<p>   <div class="gallery"><br />
   {thumb_url}<br />
   </div><br />
{/related_entries}</p>

<p>{/exp:weblog:entries}

The related entries tag pair is protected from the enclosing weblog entries tag.  If it were not, then {title} would also be parsed by the parent tag, along with any other weblog variables (and custom fields if they happened to share names).  You could use PHP on Output, though.  Note that without some additional protection, the {en_caption} field would have to have formatting set to “None” and could not contain double quotes.

{exp:weblog:entries weblog="test"}

<h3>{title}</h3>

<p>{body}</p>

<p><?php $en_caption = "{en_caption}"; ?></p>

<p>{related_entries id="images"}</p>

<p>   <div class="gallery"><br />
   {thumb_url}<br />
   </div><br />
{/related_entries}</p>

<p>{/exp:weblog:entries}