We have really unresolved problem in Integration Server. From Ordering system they sent 5 documents at a time to Enterprise server, enterprise server converts these document structures to UDM and sent these UDM docs to Intergration server, Integration Server converts this UDM structure to xml structure. Out of these 5 documents. 4 documents processing successfully and 5th doc is raising the above error. Could any body know how to resolve this problem. If they send 4 docs only 3 docs are processing 4th doc is raising the above exception.