It is now possible to set up a default 'Due date' for the Quote Invoice in 'Settings' > 'General settings' > 'Sales Module' tab.

The setting consists of 2 fields:

1. Input with the number of days
2. Dropdown with the following options:
   • after issue date - number of days after the invoice issue date
   • after invoice date - number of days after the invoice date
   • before flight - number of days before the first flight within the request

As you can see in the example below, the Invoice due date was set to 7 days after the invoice date: