Alternate version data badly formatted

I submitted an Alternate Version for the silent film "Der Kampf ums Matterhorn", #190519-195508-476000, and got the notification that it was 'badly formatted'. I did check the guide pages as to what constituted a genuine alternate version (in this case, export prints were actually truncated by three reels, changing the ending), but it gave no advice as to specific formatting required.

Is this code for another issue, such as 'submitted under wrong category', or 'evidence required' (I was only basing this on the restoration notes we were given) or 'contains ineligible information' (i. e. the suggested theory we were given as to WHY this might have been done)?