You have found a new source of supply for a material.

When maintaining the Business Partner information for the Supplier role and you have found a new source of supply for a material, the organizational unit that should be extended is the Purchasing Organization (A). The Purchasing Organization is responsible for procurement activities and negotiations with suppliers. By extending the Business Partner information to include the Purchasing Organization, you ensure that the supplier can be associated with specific procurement activities and conditions set by that Purchasing Organization.

Extending the Company Code (B)is necessary for financial transactions and accounting, but it is not specifically related to procurement activities.

A Plant (C)is typically the organizational unit for which materials are procured, but it does not need to be extended in the Business Partner information for procurement purposes.

A Purchasing Group (D)is responsible for day-to-day buying activities, but extending the Business Partner information to include a Purchasing Group is not a standard requirement.