Which Join relationship should be used in an invoice saved search to display items and original quantities from the sales order?

Using a "Created From Fields" join relationship in an invoice saved search is essential for displaying items and original quantities from the sales order because it establishes a direct connection between the invoice and the sales order from which it was generated. This relationship allows the saved search to pull relevant data from the sales order, including item details and the quantities that were originally ordered.

When an invoice is created based on a sales order, it is critical to track the source of that invoice to ensure accurate reporting and inventory management. By utilizing the "Created From Fields" join, you can effectively retrieve fields from the associated sales order, thus allowing for the display of specific item details, such as the names of the items sold and the quantities that were part of the original order.

Other choices like "Billing Transaction Fields," "Applied To Transaction Fields," and "Applying Transaction Fields" do not create the necessary connection to the sales order data. Instead, they focus on different aspects of transactions that are not directly related to the original sales order, which is why they wouldn't provide the required item and quantity information from the sales order for this particular saved search. This makes "Created From Fields" the most appropriate choice for achieving the desired results in this scenario.