When a voucher system is used, the purchases journal described earlier is expanded to include not only a column for purchases on account, but also a column for vouchers payable and columns for any other frequently used accounts as well as miscellaneous columns. This journal is referred to as a voucher register. Each expenditure is initially recorded in this voucher register as a liability by a credit to Vouchers Payable and a debit to the associated asset or expense account(such as Salaries Expense, Purchases, Equipment). Each expenditure is assigned a voucher number in sequential order and each voucher contains a file of supporting evidence (for example, purchase order, sales invoice, freight receipt).