<p>I added a note to <a href="https://wiki.openstreetmap.org/wiki/API_v0.6#Diff_upload:_POST_.2Fapi.2F0.6.2Fchangeset.2F.23id.2Fupload" rel="nofollow">https://wiki.openstreetmap.org/wiki/API_v0.6#Diff_upload:_POST_.2Fapi.2F0.6.2Fchangeset.2F.23id.2Fupload</a>, explaning that forward referencing of placeholder ids is not permitted.</p>
<p>As CGImap implements the same logic as the Rails port, and this isn't going to change in the near future, I'd suggest to close this issue.</p>

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