This is meant for companies who have multiple instances/accounts with Justlogin and there are Approvers who crossed approves leaves amongst these companies.
Note that the Approving History even for those in other companies will appear in the approving history in which the Approver logins at the moment of time.
To give a clearer picture, let me cite an example:
Let's assume John is an Approver for company A and company B.
John's default login is in Company A.
A staff in company B sent in the leave request and John approved it via email.
The approving history will appear in the Approving History of company A and not company B.
So if John wants to see which leave he had approved, he has to login to company A and check it from there.