Pantone Trans White exports EPS, AI and PDF as process colors instead of spot

I create art in Coreldraw X3. I know, it's old, but I like it and hate the X7 I have.

When I create the art, I use Pantone solid coated colors. When complete, I export the art to an ai or pdf to send to the printer. When he opens it, all the colors except for the white import/open as spot colors. The white comes in as CMYK regardless of what I try. He needs spot colors for his direct to screen printer. 

Any help would be greatly appreciated.