Our company has a purchase order with a material supplier for aggregate base materials. the pricing is favorable for our company and we don't want to lose the pricing. Due to project delays, the material has not yet been picked up and delivered to the project site. As a result, the material supplier wants our company to pay a significant amount to "hold" the material. We are concerned that if we pay for the material, there is no guarantee that when we do come to pick it up and truck it to the job site, the material will not be there and will be sold to others. Thus we would be out the money and not have the material. Can a UCC filing protect us? If so, would we need a security agreement first? Please advise. Thank you.