No able to grade a student and Higher level object Type not found

Hi All,

After saving a student from "expected process" to "assessment process" through the transaction edit assessment process we are not able to go to the appraisal dialogue for one particular student. When selecting the respected line and clicking on the icon "Goto>>Appraisal Dialogue" the system does not go to appraisal dialogue for one particular student. It was also observed that for this student there was no higher level object type and no higher level object id.
Please Suggest what could be the possible reason for the missing "higher level object type and id"

Thanks in advance

Aatish Shukla