You can edit a period if a calendar row is selected if the period is pending or
open.
To edit a Period:
From Home, select Application, then
Configuration, and then
Periods.
Select a period, and then click Edit (Pencil) or click
Edit from the Actions
menu.
Note:
You can use the filter bar to narrow down the list if you have a large
number of periods. See Filtering the Periods List
You can edit the Calendar, Start Date, Open Date, Close Date, and Frequency
check boxes. However, you can't edit the Calendar value for the base
calendar.