...
Open the yearround reservation wherefore you want to create a linked invoice reservation.
Go to tab linked reservations
Find the new button allowing you to start a new linked invoice reservation
Select the invoice dat and payment term set
Some important details are copied from the yearround reservation as DC/RC and customer details
Follow the flow to create the invoice reservation by adding applicable add-ons to the reservation and update the status. To recognize the applicable add-ons for the invoice reservation, the add-on should have a specific setting “Add-on used to charge costs to invoices for owner” activated and accommodation types valid for this add-on should be linked.
...
How to set up a task for sending communication related to invoice reservations
Create a new task in the Notification manager, select context reservation and choose your type of trigger
Open the create new conditions and add at least below condition
...
Add some other additional conditions as distribution channel, location etc.
...