Overview

Upon opening an existing project, the Construction drop-down list under the Properties section of a component may be missing, as in the image below.

This is likely to result in calculation errors such as that shown in the following Wiki: Error - "Bad reference : CONSTRUCTION" 

Method

This occurs when the DGN model has been opened in a different Workset, instead of pursuing it in the Workset where it was created. 

You might find yourself in this situation if you selected a different Workset and then Browsed to the DGN model. This will have resulted in the pop-up shown in the image below - this is very important and should be treated with care.

Issues then occur as all the data related to materials and constructions are stored in the Standards folder, within EnergyData in the original Workset, eg: 

• One can avoid this issue by continuing in the Workset from which the DGN model was originally created. 
  
  
• Alternatively, if you wish to instead continue using the new Workset, you must copy the original EnergyData folder from the original Workset, and replace the same in your new Workset.

To learn more about the features of Workspaces and Worksets, please refer to the article here.