Understanding GRN Purpose and Creation Workflows

What is the purpose of a GRN, and how and when can it be created in the purchase process?

Are you asking about why we need a GRN and the steps to create one?

Yes, I want to understand both its purpose and when it can be generated in the system.

please go through the link below

Okay, I tried creating the GRN this way, and it worked perfectly. Appreciate the help!