Displaying the General Structure (IDoc Record Types) 
Release 4.0, for example, has version 3 (long names, customer prefixes: This is evident, for example, in the case of the field SEGNAM in the data record, which contains 30 characters in Release 4.0 and previously contained only 10).
The screen is a tab page from
IDoc administration. The IDoc type attributes are not selectable, as you are calling documentation that applies to all IDoc types!The entire documentation for the structure of each IDoc, including the data elements which are used (in the following order: control record, data record and status record) is displayed. Note that typical IDocs contain several data records (segments) and status records.