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ABAP - Keyword Documentation → ABAP - Dictionary → Classic Objects in ABAP Dictionary → Views → Classic Views →Help Views
A help view is a special view for use in search helps. The selection methods of a search help can be database tables, database views, and the special help views. Database tables restrict the search help to one table and database views restrict it to inner joins, whereas help views also make outer joins possible. A help view is not defined on the database. The structure type defined using a help view can be referenced in ABAP programs using TYPE. A help view cannot, however, be accessed using Open SQL.
The join conditions of a help view must be applied from existing foreign keys. Tables can be grouped in help views only if they are joined using foreign keys. The first table included in the help view is known as the primary table of the help view. The tables added to this primary table using foreign keys are known as secondary tables. The same restrictions apply when selecting secondary tables of a help view as to maintenance views.
A help view implements an outer join, which means that the full content of the primary table of the help view is always displayed. If records in a secondary table cannot be read due to a selection condition, the content of the corresponding fields of the secondary table are displayed with initial values.
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