Retention period for reservation items

Hi all,

First of all, I have search the forum to get such infomations, but i have got nothing.

The standard setting is 30 days for the resevation resides in the system when the reservation has marked as final issue or entire quanity has been processed.

My scenario is below.

Requirement Date: 2008/9/22, and a goods movement for the reservation has been done in the same date.

When I try to delete is by MBVR, the base date is 2008/10/23, the system tell nothing to do, when i change the base to 2008/11/23, the reservation has marked as deleted.

Is there anyone have the similar case before.

Thank you in advance.

Flex Yang