XI unable to post IDOC to ECC the interface is FILE-to-IDOC scenario

Hi All,

The XI interface is a FILE-2-IDOC scenario and some times IDOC's in the receiver system are not posted. I did see successfully message for that particular messages but the IDOC's were not created in the ECC. If the messages is reprocessed then IDOC's are posted successfully to the ECC system. The message has checkered flag in the SXMB_MONI tcode.

This issue is occurring intermittently so could some point me in the right direction how to trouble shoot the issue.

Thanks,

Sarvesh