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 to a book, and checks whether to allow the net book value to go higher than the acquisition cost. Let's assume that there is a fixed asset with an acquisition price of 1,200 USD and the depreciation amount is 100 USD. If the user is going to reverse a depreciation transaction and modify the amount to be 150 USD, the system will throw an information log message indicating that the net book value will be higher than the acquisition cost, as shown in the following screenshot:
The second control point on the book denotes whether to allow a negative net book value for assets that belong to this book. Let's assume that there is a fixed asset with an acquisition price of 1,200 USD and the depreciation amount is 100 USD. If the user is going to post a depreciation transaction and modify the amount to be 1,201 USD, the system will throw an information log message to indicate that the net value of the book will be negative, as shown in the following screenshot. If we allow a negative net book value, the net book value will be equal to -1201 USD:
