Error: CSF:Update Debrief Lines (Debrief Posting Program) is completed with warning and changes Deb

 Hi Experts,

Iam working with 11.5.9 version applications.

while i am changing the Assignment status to 'Completed' Background request CSF:Update Debrief Lines (Debrief Posting Program)  is completed with warning and changes Debrief status to 'Completed with erros'.

please find the below log details.

Can anybody help me how to fix this error?

+-----------+ Field Service: Version : 11.5.0 Copyright (c) 1979, 1999, Oracle Corporation. All rights reserved. CSFUPDATE module: CSF:Update Debrief Lines +-----------+ Current system time is 08-NOV-2013 16:12:30 +-----------+ **Starts**08-NOV-2013 16:12:31 **Ends**08-NOV-2013 16:13:49 +-----------+ Start of log messages from FND_FILE +-----------+ The transaction failed because there was an error. Transaction processor error. Transaction processor error An error occurred while relieving reservations. . Transaction processor error An error occurred while relieving reservations. +-----------+ End of log messages from FND_FILE +-----------+ +-----------+ Executing request completion options... Finished executing request completion options. +-----------+ Concurrent request completed Current system time is 08-NOV-2013 16:13:49 +-----------+