Hello,
I would like to know what if the  extra code maintenance fee applies to our case :

We need a customized sales Quote and sales Order report where we add two existing . Subscription Start Date and End date are standard fields. We want them in the header  and remove another another field called  Sales Person.  The start and end date appear only on the invoice document at the line item and that is OK

That's what the general conditions say.

Maintaining custom code :

Billed per 100 lines of code, the service includes bug fixes, technical support and upgrades. It only applies to custom modules or Odoo Studio code (e.g. automated actions or calculated fields).

Thanks