Concurrent Request Lifecycle in Oracle Apps (EBS)

Concurrent Request Lifecycle

Concurrent Request/Program can be under one of four Phases . Each phase has different Status .
Phase : Pending, Running , Completed, Inactive
Status :
Pending - Normal, Standby, Schedules, Waiting
Running – Normal, Paused, Resuming, Terminating
Completed – Normal, Error, Warning, Cancelled, Terminated, Disabled
Inactive – Disabled , On Hold, No Manager
A. Pending Standby  - Phase Pending and Status Standby means Program to run request is incompatible with other program(s) currently running.
How to check Incompatible Program/Request for any Program/Request ?
Login with Application Developer responsibility
Click on Concurrent > Program
Query Program
Click on Incompatibilities button
. Inactive – No Manager
i) No manager is defined to run the request
or
ii) All managers are locked by run-alone requests
or
iii) Concurrent Manager Service is down
or
iv) No concurrent manager process because of workshift
To check Work Shift for any Concurrent Manager From System Administrator responsibility > Concurrent > Manager > Define > Work Shifts > Processes

How to check if Concurrent Manager is Up and running ?
Login as user with System Administrator responsibility.
Under Concurrent : Manager click on Administer (Actual should be equal to Target)