To add a product to an order, click on a product in the product tree to the right of the order form,
Next, make the necessary product selections and click the Select button.
Enter the quantity and price then click the Save button in the upper left hand corner.
If the validation fails for the quantity, it will be highlighted in red and a message will be displayed explaining how to correct the issue.
After correcting the quantity, click the Save button and the red highlight will be removed.