Answer:
In order to carry out the import in RFEM/RSTAB using the DSTV interface, the program requires the nodes where the cross-sections can be located.
It often happens that members are only selected in the case of the "Export only selected objects" option (Image 02). In this case, the nodes are missing in the selection. The model cannot be created.
Therefore, you have to select all objects that are necessary for the description of the model using the "Select" → "Related Objects" option (Image 03). Then, the import is carried out properly.
