Hello Tina,
For this kind of case, usually, we suggest following two solutions:
1. define the period in OB29;
2. create your own report to update the date field.
If you do not want to change the settings in OB29, then you could consider the 2nd solution.
Also, there is no standard report to delete such an order. I am afraid that you need to create your own report if you still want to delete the order.
Best regards,
Crystal Lin