Rastor image overprinting on white

I am working on a project where I'm placing a rastor image on a clear stock, with a white ink back-up of just the image.
The image is on the same layer as the vector shape filled with white. The image is in front of the white vector shape.
When I select the rastor image and go to the attributes pallet, it does not allow me to select Overprint Fill. So, when I output it, the image has no white back-up. It is just transparent.
I'm working in AI CS5 on a Mac. I have tried the rastor image (placed into AI) as a CMYK Photoshop document and as a CMYK EPS with clipping paths generated in Photoshop.
Is there a way to set the rastor image so that it will overprint onto the white vector shape? This is not a problem when I select two vector shapes, and have one overprint onto the other.

The issue may be the white.   What kind of device are you outputting to? Are you using a RIP station?
Typically, white in CMYK is interpreted as having no ink.
Also, are you certain your printing devices has white capabilities?

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