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 this field shows a string containing the position numbers of assemblies of connected parts (e.g. A17 A18 A23). In ASSEMBLY_BOLT lists Tekla Structures does not show the position number of the current assembly. Only use this field as an inquiry command for single bolts. For objects other than bolts the field is blank.