A publication which sets out how the buying organisation wishes to trade with suppliers, including, for example, standard terms and conditions of business, packaging and transportation requirements, as well as, for example, delivery requirements. This is called a:

The supplier manual will advise suppliers how they should interact with the buying organisation. A procurement manual will tell people inside the organisation what they need to do to be buying effectively - a buyer's rulebook, effectively. Similarly for a purchasing manual, and fairly obviously, a warehouse manual will provide guidance on how things should be done inside a warehouse.