Adola69
This is a common misconception. If you are delayed by a CTOT you do not need to update your FPL unless you cannot make the CTOT. In that case you should send a DLA message. When your handling agent updated your EOBT the ETFMS took that as a delay and pushed into the next available slot, in this case at the end of the queue.
I can't remember the requirements for HCS but as far as I am aware if a flight is regulated it is taken care of by the CTOT as above. If not regulated then normal ICAO update rules apply.
Its all in our manual available from all good bookshops and the website.
Best Regards
PRospero
