hi everyone,
i was trying to create a validation rule for date/time field to prevent the entry duplicate record ; in more detail i have created field using the concept of Master detail relationship and i want the the record in the date/time tobe unique i.e., if a user enters a date and time and another user tries to enter the same date and time it should show an error
kindly help me with this scenario 
Thanks Regards
Raviteja 

hi everyone,
i was trying to create a validation rule for date/time field to prevent the entry duplicate record ; in more detail i have created field using the concept of Master detail relationship and i want the the record in the date/time tobe unique i.e., if a user enters a date and time and another user tries to enter the same date and time it should show an error
kindly help me with this scenario 
Thanks Regards
Raviteja