Depending on your specific business requirements, it is possible that you will need to have custom paper formats. Fortunately, Odoo allows you to specify a default paper format, as well as indicate which reports should use a given paper format. While you may not need to use this feature, to configure a paper format, simply click the standard edit icon to the right and you will see the available options:
In the preceding example, we can see the custom paper configuration for the Leaves Summary. Most importantly, note how the Associated reports includes the Leaves Summary. This is how Odoo can associate ...