Basically, you want to detail:
1. Purchasing requisitions and approvals
2. Vendor management
3. Expense (invoice) approval
4. Expense processing (general ledger coding) and recording
5. Expense payment and invoice cancellation
6. A/P reconciliation
7. Other (i.e. Employee expense reimbursements, capital expenses, physical security of checks, etc.)
I hope that helps!
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"The words you say never seem to live up to the ones inside your head." Chris Cornell (Soundgarden)