My submitted item (e.g. declaration) has disappeared/the item added by my group is not in the file's timeline.

There can be several reasons for this: 

• In a bankruptcy, items are only visible in the timeline after the registry has processed them.
• In a JRP, items are only visible after the initiating party passes the item on to a following party or sets it to OK.
• You do not have reading rights to the item in the timeline
   

Check the 'My added items' tab in the file for more information. 
Also check the notifications on the regsol.be homepage to see what happened to your added item.