A supplier is modeled as a global entity, meaning it is not created within a business unit or any other organizational context. A procurement business unit establishes a relationship with asupplier through the creation of a site which maintains internal controls for how procure to pay transactions are executed with the supplier. The other entities of the supplier profile capture mostly external information that is provided by the supplier, such as taxidentifiers, addresses, contact information, and so on.
References:https://docs.oracle.com/cd/E51367_01/procurementop_gs/OAPRC/F1007476AN106E5.htm