Why ACTUAL_START_DATE and RELEASED_DATE for a work order is always exactly the same?

Hi,

I don't understand why the ACTUAL_START_DATE and the RELEASED_DATE for work orders are always the same (they exactly correspond).
In Oracle Documentation if I search for the WIE_WORK_ORDERS_B table I find that the ACTUAL_START_DATE is the actual start date of the work order (and I thought that it corresponded to the effective start of the work order) and the RELEASED_DATE is the date when the work order is released.

My question is, why these two informations are always the same even if they represent two different things? It's strange since they are both performed manually (the start and the release of the work order) so they cannot be logically exactly the same.