Hi,
>>>For IDoc acknowledgements we normally use ALEAUD.
but not for sync scenarios right ? Naveen is asking how to deal with a sync scenario and aleaud
is not sync but async - so let's not continue on the aleaud but give him to better option 
(at least that's my idea)
>>>I request you to please let us know the disadvantages of ALEAUD acknowledgments and also provide an alternative approach to ALEAUD acknowledgements.
just one: don't use for sync scenarios
Regards,
Michal Krawczyk