IDoc Serialization for Inbound processing

Hi Techies,

I have a requirement of sending the IDocs from XI to SAP in the same order in which they were sent from the sender SAP system.

i have a special constriant here which says "if the message get stuck in the Integration Engine (may be because of any runtime error) the messages sent after this message should not be processed.

How can i achieve this, please help.

Regards,

Jeet