Vijay,
We are experiencing the same issue in our system. In our case, we are using PI to pass the documents from external system to GTS. When we run the FM /SAPSLL/API6800_SYNCH_MASS from SE37, then everything works fine. This issue happens only while updating the existing document thru the interface (batch mode). Could you please share if you already find a solution or workaround for this?
Thanks,
Sri