clipping area borderline

Hi,

in a pdf output file I see the borderline of the clipping element  for reference files attached - I do not want to see this line

I use an element for clipping references, this element is drawn in construction class, on a level who is excluded in a pen table

so the element itself is not printed ( I've checked this out with additional elements with the same attributes)

in the output (pdf-file) there is a borderline around the clipping area

What controls this line, how to turn it off - or give it invisible attributes

OBD 10.06.03.04

can this be another bug in the OBD printing, because the border disappears if the output is rasterised
OBD updates 4 & 5 were terrible concerning printing, update 6 is better, but ...
first im. not rasterized , second rasterised

output for rasterized is much lighter, output line-wight is different - only by clicking the check-box rasterize

Rik