If you choose to charge periodic costs, you have the option to select a custom period for one (or more) periodic cost items. This is useful for recurring costs that you want to charge annually, or quarterly. Adjusting the set period allows you to split the invoicing period, as well as the associated charged amount into (several) parts. This may be useful in case of a change of ownership in the middle of a regular invoicing period.
Select custom period
Go to the Expected periodic invoices overview. Click on the invoice you want to edit, and then on 'custom period' at the bottom of the main list. You can set the start and end dates for one or more of the periodic costs listed. The invoice will then be split into one invoice for the period you just set, and an invoice for the remaining period until the regular invoicing schedule is picked up again. On the invoice, you will find the number of days charged for the cost item in question.
For example: Two of the four periodic costs are invoiced using a custom period. The invoice for the two (partially) charged costs will show up among the draft invoices, to be sent as usual. The other periodic costs will be invoiced as usual.