Documents can be associated with a part with the Reference
Document relationship to differentiate it from a specification, which defines
the part. The Reference Document relationship is used for regulatory or
internal business requirements. A reference document can be connected to a part
in any lifecycle state, even if it is released, since these documents do not
define the part.
A reference document can exist without being connected to a part. In
this case, no change object is required to release the document.
The Reference Documents page shows a list of documents that are
connected to the part with the Reference Document relationship. Additional
documents can be added either from the database or from an external source.
Selected documents are automatically connected to the part with the Reference
Document relationship.