Particle filter additive level too low

I'm getting the error message "particle filter additive level too low" on the dash. On the face of it this is simple and means the EOLYS pouch needs replacing.

However, according to http://c4owners.org/plugins/faq/faq.php?0.cat.2.78 as my VIN has the code VF7 **RHJ it means it's the 2.0HDi that doesn't have a particulate filter i.e.

Diesel:-
RHR - 2.0HDi (138) - With particulate filter
RHJ - 2.0HDi (C4 Picasso)

So I'm confused, either the RHJ code does have a DPF or the error message means something else.

Does anybody have any experience of this?

Thanks