parametric solids to SKP -> wrong scale

I have a model with normal solids and parametric solids.

When i export to SKP (sketchup), normal solids have the good size but parametric solids are way too big. 

1cm -> 2,54m   wich seems to indicate a wrong unit management (i am working in meters / millimeters).

Converting parametric solids to normal solids correct the problem (but is not a solution).

The problem occurs only with Openbuilding U6. The same file opened with Connect U13 exports correctly.