Shady Shadows Ltd sells and installs shade sails. They occasionally do a large industrial installation, however, their main customer base is homeowners.The billing process for Shady Shadows is described below. Once an installation date has been confirmed, the Installation Team Leader prepares and sends a completed Confirmed Installation form to Accounts Receivable. The Billing Officer enters the details into the computer, which saves the sales order data and prints two copies of an invoice. The Billing Officer collects the printed invoices from the computer print room and sends them to the Installation Team Leader. The Installation Team Leader checks the details and posts one copy of the invoice to the customer. As all installation invoices must be paid in full before the installation takes place, the installation request form is matched to the invoice and the matched documents are filed in customer number order in the 'Awaiting payment' file.

Required: For the process described above prepare a logical DFD. (Hint: You do not need to show the customer placing the order as the process documented above occurs after the order process; this is the billing process so the first process in the DFD will be 1.0 Create invoice)