No Common Data Areas

It is not allowed in ABAP Objects to create common data areas using the addition COMMON PART of the statement DATA.

In ABAP Objects, the following syntax causes an error message:

DATA BEGIN OF COMMON PART c,
       ...
DATA END   OF COMMON PART.

Reason:

Common interface work areas for data transfer between programs and procedures are not supported in ABAP Objects. In classes only the components visible to a user are used as interfaces, that is, visible attributes and the interface parameters of methods and events.