As I know you should add the modul name in the permisson.

please see this, and just copy and modify what you want...:

access_hr_holydays_status_user,hr.holidays.status user,model_hr_holidays_status,base.group_hr_user,1,1,1,1
access_hr_holidays_user,hr.holidays.user,model_hr_holidays,base.group_hr_user,1,1,1,1
access_hr_holidays_employee,hr.holidays.employee,model_hr_holidays,base.group_user,1,1,1,1
access_hr_holydays_status_employee,hr.holidays.status employee,model_hr_holidays_status,base.group_user,1,0,0,0
access_hr_holidays_remain_user,hr.holidays.ramain.user,model_hr_holidays_remaining_leaves_user,base.group_hr_user,1,1,1,1
access_resource_calendar_leaves_manager,resource_calendar_leaves_manager,resource.model_resource_calendar_leaves,base.group_hr_manager,1,1,1,1

• id = unique identify for the permission (Example: MY_MODULE_res_partner_manager)
• name = unique name for the permission (Example: res_partner manager)
• model_id/id = the model unique name of the class you want apply permission on (Example model_res_partner)
• group_id/id = group permission apply on (yopu can define it in xml group file or call an existing group with syntax module.group_id)
• perm_read,perm_write,perm_create,perm_unlink = the 4 values for the relative permission to read, write,create,unlink record on defined class. 1 is True (you can do this action) and 0 is Faslse (you can't)

I had to replace model name from 'hr.holidays' to 'model_hr_holidays'. I am n00b, I don't understand why I had to do that. Maybe someone is kind enough to explain...