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 the position number of the drawing main part. Can be used in drawing templates and drawing reports.

DR_PART_POS returns attribute PART_POS in all other drawing types, except for the assembly and cast unit drawings, where it returns ASSEMBLY_POS attribute value.