How to export .cdr to .dxf or .dwg?

Hello,

we use CorelDraw X5 to make cartographies on building plans with several layers of - mostly - polylines drawings (one layer = one building material type or one weathering form type) and we must give them back to architects who use AutoCAD.

We already tried several times to export the .cdr to .dxf or .dwg files, but till now, the architect seems to be able to open the files, but our cartographie is quite illegible: only some parts of the layers are visible and it seems that some layers are not visible at all...

Does someone can first tell me if the exportation .cdr to .dxf/.dwg is really possible?

If it's possible, does someone can explain me how to exactly do? (the help doesn't help me at all till now...)

Thanks,

Bénédicte