A check mark in the field forces Microsoft Dynamics NAV to check the following:

• Acquisition cost is the first entry (FA posting date is used).
  
• Acquisition cost is entered as a debit.
  
• Disposal (if any) is the last entry (FA posting date is used).
  
• Depreciable basis has a debit balance.
  
• Book value has a debit balance unless there is a check mark in the Allow Depr. below Zero field in the depreciation book.
  
• Accumulated depreciation, accumulated salvage value, and accumulated sales price have credit balances.
  
• Write-down, appreciation, custom 1, and custom 2 entries match the setting in the Sign field in the FA Posting Type Setup window.
  

If this field is blank, Microsoft Dynamics NAV only checks the following:

• Acquisition cost is the first entry (FA posting date is used).
  
• Disposal (if any) is the last entry (FA posting date is used).
  

For example, if you remove the check mark in the Use FA Ledger Check field, you can post accumulated depreciation as a debit when acquisition cost has been posted as a credit.

If the Use FA Ledger Check field for a depreciation book is blank, and the Allow Changes in Depr. Fields field is selected, you can remove or add the corresponding field for the FA depreciation book for fixed assets that use this depreciation book.

Warning
In this case, if you remove the check mark in the Use FA Ledger Check field in the FA Depreciation Books window for a fixed asset that uses this depreciation book, the result can be inconsistent depreciation for the fixed asset.

Reference