We used OpenErp v6 in our company and we want to switch to v7 but there is a little problem that I need help with. In Openerp v6 an Employee could sign in and out whenever he started working. This is also possible in v7 but in v7 the employee can choose the time. For example if he has to start at 8 am and he arrived at 8:30 am he could simple sign in and choose 8 am as the sign in time. How can I prevent this?