To Know Concurrent Request Details :

To check the Conc - Request details :
SQL> set lines 180
 set pages 1000
 set verify off
undef spid
column req_id format 99999999999
select /*+ CHOOSE*/
      'Node Name..............................: ' || q.node_name                          || chr(10) ||
      'Req id.................................: ' || Request_Id                           || chr(10) ||
      'Requestor..............................: ' || User_Name                            || chr(10) ||
      'Manager................................: ' || Q.User_Concurrent_Queue_Name         || chr(10) ||
      'Status code............................: ' || decode(status_code,'A', 'Waiting','B',
      'Resuming','D', 'Cancelled','E', 'Error', 'G', 'Warning', 'H',
      'On Hold', 'R', 'Normal','S', 'Suspended', 'T', 'Terminating',
                      'W', 'Paused', 'X','Terminated', status_code)                                       || chr(10) ||
      'Phase code.............................: '  || decode(phase_code, 'C', 'Completed',
      'I', 'Inactive', 'P', 'Pending', 'R', 'Running', phase_code)                        || chr(10) ||
      'Priority...............................: ' || Fcr.priority                         || chr(10) ||
      'Program................................: ' || Fcp.User_Concurrent_Program_Name     || chr(10) ||
      'Time so far ...........................: ' || trunc((sysdate-Fcr.actual_start_date)*24*60,2)||' min'|| chr(10) ||
      'Avg execution time in  30 days.........: ' ||  trunc(AVG_TIME,2)  ||' min'          || chr(10) ||
      'Max execution time in 30 days..........: ' ||  trunc(MAX_TIME,2)  ||' min'         || chr(10) ||
      'Fastest execution Time in 30 days......: ' ||trunc( MIN_TIME,2) || ' min'          || chr(10) ||
      'Number of executions in last 30 days...: ' ||occurance                             || chr(10) ||
      'ClientPID..............................: ' || Fcr.OS_PROCESS_ID                    || chr(10) ||
      'ServerPID..............................: ' || Fcr.ORACLE_PROCESS_ID     || chr(10) ||
      'Arguments passed to the program .......: ' ||Fcr.argument_text
                     from apps.Fnd_Concurrent_Requests Fcr,
    apps.Fnd_Concurrent_Programs_vl Fcp,
    apps.Fnd_Oracle_Userid O,
    apps.Fnd_Concurrent_Processes P,
    apps.Fnd_Concurrent_Queues_vl Q,
    apps.Fnd_User,(select
    concurrent_program_id
    ,count(concurrent_program_id) occurance
    ,min(actual_completion_date-actual_start_date)*24*60 MIN_TIME
    ,max(actual_completion_date-actual_start_date)*24*60 MAX_TIME
    , avg(actual_completion_date-actual_start_date)*24*60 AVG_TIME
    from apps.fnd_concurrent_requests
    where status_code='C' and phase_code='C'
    and trunc(actual_start_date)>trunc(sysdate-30)
    group by concurrent_program_id
    having max(actual_completion_date-actual_start_date)*24*60 >5) CREQ
    where Controlling_Manager = Concurrent_Process_ID
    and ( P.Concurrent_Queue_ID=Q.Concurrent_Queue_ID AND P.Queue_Application_ID = Q.Application_ID )
    and O.Oracle_Id = Fcr.Oracle_Id and Request_Id in ('&REQID')
    and( Fcr.Program_Application_Id=Fcp.Application_Id
    and  Fcr.Concurrent_Program_Id=Fcp.Concurrent_Program_Id)
    and Requested_By = User_Id
    and Phase_Code = 'R' and status_code in ('R','T')
    --adding joins with new
    and Fcr.Concurrent_Program_Id=CREQ.Concurrent_Program_Id(+)
                                          Order By   Q.User_Concurrent_Queue_Name,q.node_name, Actual_Start_Date,Request_Id;
--------
Enter the Request-id.
++++++++++++++++++++++++++++++++

Find Concurrent Request picked up by which Concurrent Manager

++++++++++++++++++++++++++++++++

select a.user_concurrent_queue_name

from fnd_concurrent_queues_vl a,

FND_CONCURRENT_QUEUE_CONTENT b,

fnd_concurrent_programs_vl c

where a.concurrent_queue_id=b.concurrent_queue_id

and b.type_id = c.concurrent_program_id

and c.user_concurrent_program_name='& Concurrent Program Name';

++++++++++++++++++++++++++++++++
Terminate the concurrent Request 

Note:If you have Approval / Confirmation  Please go-ahead
Login to dbnode  as apps user

update applsys.fnd_concurrent_requests
   set phase_code = 'C',
       status_code = 'X',
    actual_completion_date = sysdate
  where request_id = '&R';

Enter the Request-id.

commit;