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 attribute shows the top level of an assembly. Top level takes the unit and accuracy from the MarkDimensionFormat.dim dimension property file. You can modify the settings saved in MarkDimensionFormat.dim in the dimension property pane in a drawing.

Adding _BASEPOINT at the end of the attribute gives coordinates relative to the base point selected in the view, and adding _PROJECT at the end gives coordinates relative to the base point selected as the project base point. _BASEPOINT uses the current base point in the same way as the workplane uses the current workplane: If there is no current base point defined, _BASEPOINT provides values relative to model origin (Global).

You can use this attribute as a user-defined attribute also in part marks and associative notes.