You can link documents to data in the following ways:
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Document number linked to data at the project level
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Document number linked to a material (table detail) at the specification level (product form)
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Document number included in a commodity code (for example, a document related to the object or to the material applied to the object)
Document number at project level
This functionality is a custom development, and the standard product only includes a CIP.
Document number linked to a material at specification level
Double-click a specification item in the Spec Templates/Item/Item Details view, and then specify a material document table. This table is used as the source of reference documents on the Cover page in the Spec Editor.
The Pipe Material grid on the Cover page in the Spec Editor has a Ref Document column, which contains the reference document table detail.
In addition, the Pipe Material grid on the Cover page has an MPD (material product dependency) column. By clicking the browse buttons, you can assign details to product forms or link reference documents.
The reference document detail from the main material is included in the generation search criteria for component groups.
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For pipe component groups, the main material plus the reference document table detail are included in the generation of commodity codes.
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For non-pipe component groups, if material product form dependencies exist for a specification, these dependencies are considered during generation. In addition, if there are any documents defined for the material detail, the software considers these documents while searching for commodity codes.
Document number included in a commodity code
In the Tables grids, you can specify whether or not a table is a document table.
If a table is a document table, the Selection list for it does not show table details; instead, it shows documents from D.10.11.
When a document is selected from the Selection list, if the document is already associated to a table detail, that table detail is re-used. If not, then a table detail is created with that document and is used. The table detail is created based on the information supplied by a CIP named M_PCK_DOC_TYPE_CUSTOM.GET_TABLE_DETAIL_INFO.
When the software creates the new table detail, if the table group is not specified, the table detail is created under the table group DOCU_GROUP. If a table group named DOCU_GROUP does not exist, the software creates it. If the table group is specified, the table detail is created under the specified table group.
To link document classes to document tables, click SRD > XS20 Spec > XS2010 Project Setup, and select Link Document Classes on the left side of the dialog box. When you link a document class to a document
table, the Selection list 
on the document table is filtered by the document class to which it is linked.
If the project default ZX_DOC_CLS is set to N, the Document Classes, Document Numbering, and Link Document Classes nodes in Project Setup are opened in read-only mode.