Number Ranges in New GL

Hi

I am working on IDES version.

In the new GL - we can define two types of Doc no ranges. 1. for define doc no ranges for data entry view & 2. Define doc no ranges for GL View.

What is the difference between both these. Is it mandatory to have both, if not, when do we generally need to maintain. what are the advantages of maintaining the same.

Thanks,

Srikanth