Thank you Igor MF, I have tried, but i got this error " ValidateError Error occurred while validating the field(s) date_from, date_to: You cannot have 2 timesheets that overlap! Please use the menu 'My Current Timesheet' to avoid this problem. " Please tell me "what rights the user should have to do this. I tried this with "admin" user.

I have assign only one user more than three users. i.e employee names e1, e2, e3 but related user is "user1". does this user1 can make time sheet to those three employees?

@samba, "You cannot have 2 timesheets that overlap" is not related to user rights, the system actually searches if there are other timesheets for that employee in the same date-range. If any day match, it won't let you create a new timesheet, overlapping another one... Try removing all search filters on the list view and check if there are other timesheets open for that user

Thank you Igor MF. My problem solved when i create one user for one employee i.e if i need to enter 10 time sheets for 10 employee for a week, it's mandatory to create have 10 related users for 10 employees. Try the above scenario what i mention in first comment, it's definitely raise the warning. I had one conclusion with this warning. In openerp it is mandatory to create a user for employee. Please suggest me, if i am wrong any where..

@samba, you are actually right... This is definitelly a bug, where it checks on the user's timesheets, instead of on the employees... Should be reported..