AUTOCAD TRANSLATION SCALE PROBLEMS

Hi,

I am having scale issues translating files into Autocad format. Specifically, an Autocad 2010 Civil 3D user sent me a file which I used for a background to my AC 11 building file. After merging the two files, I returned the revised acad file in the 2004-2006 dwg format. When the file is opened in Autocad, the proportion and scale is not correct. Other than increasing or decreasing the units by a factor of 12 during the translation, the drawing scale is not being manipulated in any way. Any thoughts?

Please help.

I did not find the right solution from the Internet.

References:-
archicad-talk.graphisoft.com/viewtopic.php?t=35654
Custom explainer video animation studio

Thanks!