Document Item 

Document items are supported in all BOM categories (for example, material BOM, equipment BOM), so that you can document the product or component in detail.
In document structures, you can only enter document items and text items.

A document info record must exist in the document management system for the document.

The document info record contains master data for integrating the document into organizational procedures, for example, information on the processing status and storage location of any existing original application files.
Depending on the document type, you can maintain different documents (such as design drawings, photographs, or texts of any word-processing program)

A document in a document item can be copied to a production order. Detailed information can be found in the SAP library under Production orders (PP-SFC) ® Document integration in the production order.