Raster Image Frames in pdf

Hi Guys,

i have a dgn file with another dgn as a reference where raster images are included.
Now i want to print my geometry with this raster as a background from an layout model but in the pdf every raster image frame is drawn. (but i dont need them on my pdf)
Interesting is when i print out of the normal model these frames will not be drawn.

But i have to use the created layout models because of mapsheet etc....

Maybe u can help me to get these frame sout of my pdf

Greetz and Cheers