Avoid generating timesheet services generation before backdate is entered.
Sales Confirmation Backdate - Sales Timesheet
![Sales Confirmation Backdate - Sales Timesheet [11.0.0.1]](https://d2cogkmcxzch5w.cloudfront.net/web/image/odoo.module.version/2028/icon/Sales%20Confirmation%20Backdate%20-%20Sales%20Timesheet%20%5B11.0.0.1%5D?unique=74aecaf){kind=icon}