Additional Data for a Document 
Use
The fields on the Basic data screen of a document can be extended. For example, you may be required to make entries for size for certain documents. This data that is in the document info record can be added using classes and their allocated characteristics.
Prerequisites
You must perform the following in the classification system:
When you define the characteristics, for example, you determine how the characteristic is displayed, the data type, and the allowed values.
Enter the characteristics for the class, for example LENGTH and HEIGHT characteristics for the SIZE class.
Features
The characteristics of the class appear as additional fields for all documents of this document type.
Maintenance is done on different tab pages. The description of the class is generated as a head for the tab page. For example, in addition to the standard you see for all the documents of the document type MAD tab pages with additional fields for LENGTH and HEIGHT. These can also be maintained.

If the class is part of a class hierarchy the fields of all superior classes are displayed within a class hierarchy.
Activities
The settings for the additional data are made in Customizing Document management; under Control data ® Define document type
® Detail screen.
For example, for the MAR document type, enter the standard class type 017 (document management) and the SIZE class. LENGTH and HEIGHT are allocated to this class.
You can maintain the tab pages Length and Height for all documents of the document type MAR.