This is a template attribute. Template attributes can be used in filtering, or to retrieve data from the model to use in drawings and reports. For example, when you create a report, Tekla Structures replaces the attributes added in the report template with the corresponding object property values.
This template attribute is the number of the procured part.
The attribute can be used in reports and drawings, and for filtering.
It is related to the Tekla PowerFab Connector procurement workflow.