User Help > Linking and Tracing Between Members and Items > Source Link Fields: Overview > Source Traces Data Model
Source Traces Data Model
A source trace represents the relationship between one item (requirement) and one source member. Both the requirement and source member are versioned in Windchill RV&S. An item version is represented by a timestamp, while a source member revision is represented by a revision number such as 1.1.
Each item and source member can have multiple source traces.
Logical Model
Source traces are stored as part of the item in Windchill RV&S, providing full history and versioning. Source traces work with items through the Source Link field type when Trace is enabled. Any number of these fields can be created and made visible on an item type. Each field provides a container for source traces of the same type, for example, traces to implementing source or traces to source being verified.
Physical Model