Add Notification in Automation Module "Sales invoice is overdue"

Hi,
we are looking for a way to automate our dunning process via Cin7 Core.
Although there are a couple of Notification options within the Automation module, it seems to miss a notification of the type “Sales invoice is overdue”. There is a “Purchase invoice is overdue” notification only.
Could you please add a Notification for “Sales invoice is overdue”. The logic can be similar to “Purchase invoice is overdue”.
Thank you!