After run forecast scheduling, the system delete all approved forecast plan order

Hi,

I have problem with the forecast scheduling, after i had run forecast scheduling process, the system delete all approved forecast plan order. While when I run the Master plan, the system still keep the approved master plan order.

Do AX2012 has the setup on forecast scheduling? Please advise.

For the master scheduling, there is principle (Regeneration, net change..) to select but at forecast plan no parameter to select.

Thanks and regards,

Tippawan