Date of Last Credit Review update

Hi,

Wanted to understand the functionality for "Date of Last Credit Review" on Credit tab of customer mater application.

1. When does this field gets automatically updated?

2. We changed "Recall for Review Date" and this field "Date of Last Credit Review" was populated with same value

3. Is there any document available to explain how and when this field "Date of Last Credit Review" get automatically updated.

Thanks,

Ambadas Ramkar