Cant detach reference files

I've seen this happen in the Civil Products. In the Civil products, this problem is created because of a new model being created in the background. I don't know if this is the same as Prostructures.

is there a solution or do we just get to have files filled with models and reference files we cant delete?

is there a solution or do we just get to have files filled with models and reference files we cant delete?

http://communities.bentley.com/products/projectwise/content_management/f/342986/t/109300

here you have several solutions and explanations for this case.

Hope this solves your issue  in the right way.