Why can't the appraisal be closed after the staff acknowledged

Why can't the appraisal be closed after the staff acknowledged

Symptoms:
The Default Appraisal Administrator will be the one who can close the appraisal. 

Possible cause(s):
None 

Suggested workaround/ solution(s):

To check who is the 'Default Appraisal Administrator'
  1. Under Appraisal > Appraisal Management > Appraisal Options > Default Appraisal Administrator > it will indicate the admin.

To close appraisal, after staff acknowledgement.
  1. Under Appraisal > Employee Appraisal > Transaction > Action Task: Close Appraisal Transaction.
NOTE :
You may indicate the 'Transaction number' and made a search or other fields such as 
1) Look for Staff
2) Appraiser
3) Request Type
4) Status
5) Appraisal Form
6) Performance Period