The Attendance has been deleted and it needs to be recreated. There is no way to undelete the records because when an Attendance record is deleted in Attendance(ATT), the data is erased as well as deleted. 

Possible Causes

• A user may change a student to a No Show instead of Inactive
• A user may change the Leave Date and any attendance after that date is deleted.

Resolution

Use the Attendance Log Report to recreate the records. 

Use the Student look up to find the individual student. 

Then use the report to input each line

Workaround

A query for LOG table can be used, but it is raw data and a little harder to decipher. 

LIST LOG BY DT IF OB = ATT AND ID = XXXXXX