What workflow are you using?
None, it´s a standalone preps, I know that prinergy can do it the way the customer wants. But it´s the old problem... "It worked before you updated from Preps 5 to preps 8.
Rampage could re-map as well with special spot color names in the color bar. I see there is remapping in the print dialog, does that help in any way?
Sadly it doesn´t as the customer has a Heidelberg RIP. In the meantime the customer has accepted that they are not able to get it to work and I havn´t heard anything since.