Reminder: Maximum Credit Window is a condition. It will always be placed above the Prefer off and Award bid preferences. This bid cannot be forgotten and it will automatically be placed above your first Award bid preference, if you attempt to add it below an Award bid. The interface will not allow the bid to be moved below an Award bid, nor can an Award bid be moved above it.
It tells the N-PBS Scheduler to award you a block closest to the maximum allowed credit as possible