Clarification on Number Ranges for Customer Returns

Hi Experts,

We have 2 types of Number Ranges basically for Customer Returns.

1. Business Configuration --> Fine Tuning --> Document Numbering Formats for Inbound Delivery --> Customer Returns

2. Business Configuration --> Fine Tuning --> Number Ranges for Sales Orders, Customer Contracts, and Customer Returns --> Customer Returns.

I would like to know what is the difference between these 2 Customer Returns number ranges.

Regards,

Samraj