Hello Smriti,
Can you clarify the issue for me - you have created one appraisal document and in the header data have defined the part appraisers as the employee and subordinates, and only the employee is unable to access the part appraisal document?
When you created the appraisal template, on the 'Roles' tab, is the role for 'Self' ticked?
Can the employee access any of his other appraisal documents from the portal?
Is IT0105 data maintained for the employee's SY-UNAME?
Regards,
Kendall