Missing IDocs

Hi Gurus,

My scenario is Legacy (JMS)-> PI -> ECC (IDoc).

I have sent 1000 messages from Legacy.. and I can see all of them with success

status in MONI and at IDoc adapter level using IDX5.

I do not see anything in SM58 as well.

But I find only 900 IDocs in ECC.

What could be the reason behind this and how should I troubleshoot the same.

Regards

Pushkar