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Hierarchy Maintenance 
Hierarchies allow you to create classification structures showing the relationships between categories. A hierarchy is constructed like a tree structure with a root category that includes all other categories. The root category is the highest-level node within the hierarchy and does not generally contain any control information.
The Maintain Categories and Hierarchies function shows the tree structure in the upper half of the screen and a row of tabs in the lower half, allowing the relevant data to be maintained:
· Hierarchy
· Category
For more information, see Category Maintenance.
· Set Types
Set types are maintained for the selected category.
· Relationship Types
Relationship types are maintained for the selected category.
The following features are available at hierarchy level:
· Numbering Scheme
You can assign category IDs yourself (alphanumeric or numeric), or they can be assigned automatically (numeric only).
Numbering schemes are defined and the necessary settings made in the Customizing activity of Cross-Application Components under SAP Products ® Product Category®Define Category Numbering Schemes.
· Standard Schema
You can enter information showing that the product schema (hierarchy) displayed is a standard schema.
1.
In the user menu,
choose Maintain Categories and Hierarchies.
The Maintain Categories and Hierarchies screen
appears with either the locator or work area, depending on your user
settings.
2.
Choose Create Hierarchy.
The dialog box Create Hierarchy appears.
3.
Enter a hierarchy
ID and description, and choose Continue.
The hierarchy maintenance screen is then displayed.
4. If you want to assign category IDs using a numbering scheme, specify the numbering scheme required.
5. Save your data.
If no categories are assigned to the hierarchy, you can change the hierarchy description, the numbering scheme, and whether category IDs are assigned automatically.
If categories are assigned to the hierarchy, you can change only the hierarchy description. It is not possible to change the numbering scheme and automatic number assignment because they influence the category IDs in the hierarchy.
A hierarchy can be deleted only if no categories are assigned to it. Therefore you must first delete the categories.