This is a new concept introduced in Microsoft Dynamics 365 for Finance and Operations. The book represents the financial value of the fixed asset that belongs to the book, and it can be the integration point between fixed assets and the general ledger in the posting profile. In order to access the book, go to Fixed assets | Setup | Books. The following screenshot shows the Books form:
The depreciation profile is attached to the book, and it identifies whether the assets that belong to this book will be depreciated or not. The depreciation can be overridden on a fixed asset level.
The book identifies the control point on the assets belonging ...