Consider the following scenario. You have customized fields on the following entities so that the fields contain a default value:
When you create an order, an invoice, or a quote from an opportunity, the customized fields in the order, the invoice, or the quote are not automatically populated with the default value in Microsoft Dynamics CRM 3.0.
For example, you customize a picklist field on the Order entity to use a default value. Then, you open an opportunity, and then you create a new order. When you open the new order, the picklist field does not contain the default value that you specified.