Co Data Flow Diagram 1. A vendor sends a sales invoice to the accounts payable process to record the invoice in the accounting system (Accounts payable record) and to prepare and sign check which send to vender. 2. Statements are prepared and sent to customers from data contained in the accounts receivable data store. Co Data Flow Diagram 1. A vendor sends a sales invoice to the accounts payable process to record the invoice in the accounting system (Accounts payable record) and to prepare and sign check which send to vender. 2. Statements are prepared and sent to customers from data contained in the accounts receivable data store