Reschedule of Partially Confirmed WOs

Hi Experts,

I would like to get your help for the following :

I have created a PM Work order with single operation, that operation has been completed partially through IW41.Now the constraint i am facing to reschedule the WO for future.When ever i am putting the basic start date in future which is very true because i have to complete the remaining work in future & pressing the Schedule icon system wont allow me to plan the activity in future.

May i know how can I plan the remaining activity in future.I don't want to deselect the automatic scheduling Indicator.Also please note that I would like to calculate the Basic finished date automatically after pressing the schedule button.

Appreciate your help.

Regards,

Kavvya