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.

Shows whether a surface is attached to a part or to a pour.

The attribute returns 0 if the surface is attached to a part, and 1 if the surface is attached to a pour.