Freeze (Bill Segment)
Clicking the Freeze button causes a freezable bill segment to become frozen. Refer to Bill Segment Lifecycle for more information about freezing.
This button is enabled if:
• the Freeze At Will Bill Segment Freeze Option on the installation option has been selected AND
• the bill segment is freezable.
Note: 
Freezing a day or more after generation. If the bill segment is linked to a closed accounting period, a pop-up appears in which you can specify a new accounting date. This will only happen if the accounting period closes before you freeze the bill segment (the accounting date is stamped on a bill segment when it's initially generated).
If problems are detected after freezing. A bill segment may not be changed after it is frozen. All subsequent changes must occur by canceling the frozen bill segment and creating a new bill segment. Refer to How To Cancel A Bill Segment and How To Cancel / Rebill A Bill Segment for more information.