When a project is created in Zoho Projects and synced to Zoho Books with the Fixed Cost billing method, the option to create Recurring Invoices for those project timesheets will not be available. This is because fixed cost projects have a predetermined, fixed fee that is not based on variable factors such as staff hours or task hours.
As a workaround you can associate the project at the time of creation of the recurring profile. To do so:
If you have choose the billing method Based on staff hours or Based on task hours for a project and it has been synced with Zoho Books, you can create a recurring invoice for that project. The timesheets recorded for the project will be automatically added in the next child invoice.
Books
Online accounting software
for small businesses.