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Modeling the Purchasing Organization in the
Organizational Plan 
In order that worklists for processing purchase orders can be created and to enable reporting, you must have defined your purchasing organization.
Each purchasing organization and purchasing group in a company is defined as a procurement organizational unit.
Each purchasing organization or group must be a node (organizational unit).
In the case of a local purchasing organization, users (professional purchasers) are assigned to the procurement organizational units. If the purchasing organization is located in an SAP backend system, these organizational units are only used to forward the necessary values from the backend system. In such a case, no users are linked with the organizational units.
You do this as
described below in the Customizing for the organizational plan. (Menu path in
the Implementation Guide (IMG):
Supplier Relationship Management ®
SRM
Server ®
Cross-Application Basic
Settings ® Organizational Management ® Create/Change Organizational
Plan.)
· You define the relevant organizational units.
· You define the purchasing organizations and purchasing groups using the Type tab.
· In the case of local purchasing organizations and purchasing groups, you leave the additional fields for organization and group in the backend system empty. However, if a purchasing organization or group corresponds to an organization or group in the backend system, you can define this using the input help.

Attributes PURCH_ORGX and PURCH_GRPX are no longer used.
· Save your entries.

It is no longer necessary to activate the function of an organizational unit.
You can define organizational and product responsibility on the Responsibility tab.

Attributes RESP_PGRP and RESP_WGR are no longer used.
· You define product responsibility in the upper area of the tab page. You can enter individual product categories or value ranges for product categories. You can use wildcards (*) to do this. You can select the source system from which the product category is replicated from the list.
· Specifying product responsibility is optional. If your procurement department is organized by product category, you should assign all your product categories to purchasing groups using this attribute. If you fail to do so, all the orders relating to unassigned product categories will be assigned by the system to the same purchasing group. This only makes sense if you intend a particular purchasing group to assume the role of dispatcher.
· In the lower area of the tab page, select organizational responsibility. You can use the input help to select the departments or groups for which the purchasing group is responsible. The organizational responsibility has to be defined for purchasing groups.
The following graphic shows an example of how product and organizational responsibility might be defined in the organizational plan. In this example, purchasing groups 1 and 2 are both responsible for purchases made by the same departments (represented as organizational units 50002974 and 50002975). While purchasing group 1 processes all shopping carts containing items from product category 00105, purchasing group 2 processes all shopping carts containing items from product category 001.

Vendors can no
longer be assigned to purchasing organizations in the buying company’s
organization model by using transaction PPOMA_BBP. Instead, you have to use
transaction PPOMV_BBP to group
vendors with identical attributes in an organizational object, the so-called
vendor group.
For further information, see Creating the
Organizational Plan.
To make the connection between purchasing organizations and purchasing groups more flexible, you can lessen the restrictions of the organizational model.
Employees that are assigned to the line organization of the HR organizational model and work as purchasers in an SRM purchasing organization can be assigned to the new relationship type Is Purchaser of...
For more information, see the section Creating the Organizational Plan of the Business Scenario Configuration Guide Self-Service Procurement. You can find this guide in SAP Service Marketplace at service.sap.com/ibc-srm.