Use the database tables below to answer the following questions. 
-Which field in the PURCHASE ORDERS table is a foreign key?
Definitions:
General Journal
A general journal is a fundamental accounting record where all day-to-day financial transactions of a business are initially recorded.
Ledger Accounts
Financial records within a ledger that summarize the transactions related to a company's assets, liabilities, equity, revenues, and expenses.
Trial Balance
A financial spreadsheet where the totals from all accounts are gathered into columns for debits and credits, serving to verify the mathematical accuracy of a firm's accounting records.
Balance Sheet
A financial statement that presents a company's financial position at a specific point in time, including assets, liabilities, and equity.
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