Once an oncost group has been created you can edit the following header attributes of the oncost group record if necessary:
name
description
active status.
Depending on whether the oncost group has already been used to generate invoices, you may also be able to perform the following actions:
change the start and end date of an existing validity period
add or remove oncosts for an existing validity period
add a new validity period
delete an existing validity period.
The Last Invoice Date field in the header of the Billing > Maintenance > Oncost Groups > Oncost Group Maintenance > Oncost Group Entry screen displays the date of the last invoice that used the invoice group.
If no date is displayed in the Last Invoice Date field, existing validity periods for the oncost group can be edited without restriction.
If the oncost group has already been used when an invoice was generated, no changes can be made to any existing validity period for the oncost group if the date that is shown in the Last Invoice Date field falls after or within the validity period. The exception to this is if an existing validity period has not end date, in which case the validity period can be end dated so long as the end date falls on or after the date shown in the Last Invoice Date field.
To update an existing oncost group, follow the procedure below.