Who is responsible for documenting the value being delivered to the customer?

The value innovation cycle proposes a cycle of

1. Create Value
2. Communicate Value
3. Deliver Value
4. Document Value
5. Capture Value (this is where pricing comes in)
6. Create Value

All this turning around a deep understanding of economic, emotional and community value for a customer.

Documenting value is of critical importance, especially in subscription models or repurchase models.

Who should be responsible for this value documentation work?