When we establish a BPA is there a requirement to solicit more than one source or can we negotiate with one specific vendor?

When establishing a BPA the customer must follow the ordering procedures in FAR 8.404, which state, for orders above $2500 the customer must review 3 price lists or use GSA Advantage and make a best value selection. Once this selection process is completed and the BPA is established orders are simply placed against the BPA – no further documentation or justification is required. If an agency requirement in excess of the micro-purchasing threshold is defined so as to require a particular brand-name, product, or a feature of a product peculiar to one manufacturer, thereby precluding consideration of a product manufactured by another company, the ordering office shall include an explanation in the file as to why the particular brand-name product or feature is essential to satisfy the agency