Contracts Status Change by Contract Program error

Hi,

I have come across this error while running the concurrent program "Contracts Status Change by Contract".

The contract end date was on 31-Mar-2013 and was supposd to be expired butwhen I run this program I get this strange error message:

"The current operation failed as another user is updating this contract. Please try this operation later."

Please let me know if you guys have any clue about this. Below is the data form log file.

Contracts Core: Version : 11.5.0

Copyright (c) 1979, 1999, Oracle Corporation. All rights reserved.

OKCPSTCC module: Contracts Status Change by Contract
+---------------------------------------------------------------------------+

Current system time is 28-JUN-2013 03:14:41

+---------------------------------------------------------------------------+

**Starts**28-JUN-2013 03:14:41
**Ends**28-JUN-2013 03:15:38
+---------------------------------------------------------------------------+
Start of log messages from FND_FILE
+---------------------------------------------------------------------------+
old_sts_codeACTIVE
old_ste_codeACTIVE
new_sts_codeEXPIRED
new_ste_codeEXPIRED
acn_assemble- chr_id = 1491624
acn_assemble - Invoking OKC_K_HISTORY_PUB.create_k_history
OKC_K_HISTORY_PVT.create_k_history - Return status = S
acn_assemble - Return status from OKC_K_HISTORY_PUB.create_k_history = S
acn_assemble - Invoking send message
acn_assemble - Return status from OKC_AQ_PUB.send_message = S
update_contract_header After call to AssmblrS
update_contract_header After call to Update_Minor_VersionE
The current operation failed as another user is updating this contract. Please try this operation later.
Program error encountered while changing contract BE0000212 - R23-MAR-12 08:39:02 status to Expired. Please contact your support representative.