behavior of cancel messages

[Steven L. Sesar]

We have an issue where a piece of software allows a user to delete his or her own post to an internal newsgroup. The software accomplishes this by first telnetting to port 119 of the news server, issuing a mode reader command, issuing a group <group> command, contructing the cancel message using the following headers:

From: <user>
Newsgroups: <newsgroup>
Subject: cmsg cancel <message-ID>
Control: cancel <message-ID>

followed by "." and CR.

This had been working fine while we were on our old news server which was running INN 2.2.2.

The problem is  that it doesn't actually cancel the article under 2.3.2 unless I add an Approved: header.

My question is, has anything relevant to cancel messages changes between INN versions 2.2.2 and 2.3.2?