Hi Nagarajan,
please have a look into the Customer Checkout Monitor for the document.
If you find a inconsistent document mark it and scroll down.
you will find there an error message.
it looks like
999 - DI Error: (-5002) 480000112 - Batch/serial number selected in row 1 does not exist, specify a valid batch/serial number
In SAP Note 2202185 you will find the explanation of the error messages in the trouble shoot section.
it also could help if you check the log file as Radek mentioned
