> ## Documentation Index
> Fetch the complete documentation index at: https://docs.activeviam.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Books

> The Books hierarchy in the Booking dimension of FRTBCombinedCube, providing unique book identifiers as the leaf-level dimension for filtering and aggregating positions by book

|                 |                          |
| --------------- | ------------------------ |
| **Description** | Unique book identifiers. |
| **Dimension**   | Booking                  |
| **Hierarchy**   | Books                    |
| **Levels**      | \[ALL, Book]             |