The hotel night audit process can become quite complicated when errors are discovered. It is generally considered more efficient to balance all departments first and then look for individual posting errors within an out of balance department.
The night auditor balances all revenue center departments using source documents. The hotel night auditor seeks to balance all front office accounts against departmental transactional information. Vouchers received at the front desk and other documents are totaled and compared to the revenue center summaries. Even fully automated hotels generally maintain source document because they can help resolve discrepancies should they arise.