FA Depreciation Book is used to define your Depreciation Starting, Depreciation ending, and Remaining Life.
There might be an issue with your upload file. Try exporting the template and paste the data the exported file and import it back to the Configuration package.
For the Begbal, as mentioned by Josh, you can use the Fixed Asset Journal but make sure your G/L Integration is deactivated. We usually load the Acquisition costs FA Posting Type 'Acquisition Cost' and the accumulated depreciation with FA Posting Type 'Depreciation'.
AFter positng, enable again the G/L integration for the succeeding FA transactions.
