Integration of a BOS in a Sales Document You must have made the settings in Customizing for
Sales and Distribution
and in the material master record, if you want to integrate a BOS into a sales document.
All sales documents have the same basic structure. They consist of a document header and document items.
The BOS represents an independent data object, which however can only co‑exist with a sales document. It can be found underneath a document item.
The data is displayed on several screens, similar to the structure of a sales document.
The functions of BOS entry and processing are provided on the
Item Data
screen on the
Services
tab page.

The Services tab page is only displayed if you have created a document item with a BOS. To do this, use the appropriate dummy material.
If you create a document item with another material that does not correspond to the required settings in the material master record, this tab page is not displayed.
See also:
Copying Control for Sales Documents