We get this quite often as material suppliers. We have customers that purchase materials from us for a replacement job that isn't new construction. They are getting the material simply to replace an existing part(s). Do we have lien rights? Do we need to worry about getting a job information sheet? If the order is thousands of dollars, we worry about not being able to protect ourselves and to help get us paid. In instances like this one, the customer will say that they will simply buy elsewhere and we could potentially lose their business.