Release status of tasks

[Robin Sahasranam]

Greetings,
 
We have several productive workflow standard tasks in a 4.6c system, which are
functioning properly, even though the Release status of these tasks in the PFTC
transaction shows " Not defined". These tasks were created in 4.0b and I do not
recall this  field being available then.
I also noticed that many SAP delivered tasks are also of status "Not defined".
 
 Is it important to  change the status to "Implemented" or "Released".?
 
Also what is the difference between "Implemented" and "Released" and which
should be used when a task is productive?
 
Thanks for taking the time to respond.
 
Robin Sahasranam
World Bank.