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.

For bolts, shows 1 for existing and 0 for non-existing washers and nuts (for example, 10011). For objects other than bolts, the field is blank.