SharePoint Online Merge Unsupported
<p>I am trying to merge an item into an existing list in SharePoint Online, but receive the following error:</p>

<pre><code>"The type SP.ListItemEntityCollection does not support HTTP PATCH method."
</code></pre>

<p>My configuration is as stated in Microsoft documentation. <a href="https://msdn.microsoft.com/en-us/library/office/jj164022.aspx" rel="nofollow">https://msdn.microsoft.com/en-us/library/office/jj164022.aspx</a></p>

<p>Is there a problem with the permissions for this type of item in the list? How can I modify that? I have seen no references to different types, or resolving this issue.</p>