Warehouse → Sales To issue an invoice, go to the "Sales" module and click the green "" button. "Invoice Type": Select the type of operation. The series, number, and sales date will automatically populate. Specify the buyer/recipient by clicking the black pencil "" button. In the window that opens, select an existing customer or create a new one by clicking the green " button. In the "Product/Service" field, enter the product or service name, specify the unit of measure, quantity, and price. To add more products or services, click the green "Add item/service" button and fill in the necessary information. To apply a discount, enter the discount percentage in the "Discount (%)" field. If you are a VAT payer, select the appropriate VAT rate in the "VAT Rate" field. Click the green "Save" button at the top to save the entered data. To print the issued invoice, click the "Print" button at the top. Choose invoice template, language, format, and click the green "Generate" button. To send the issued invoice via email, click the "Send by Email" button at the top. Choose invoice template, language, format. Enter the recipient's email address, write a message, and click the green "Send" button. You will find the saved invoice in the general invoice list under Warehouse → Sales module. Note: If you want to use your own series for sales documents: set the parameters in the module Reference book → Warehouse → Doc. series. That is, assign the series and number you need to the operation and be sure to check the box Print invoice.