How to add columns on MFN

Hello,
I would like to add columns on MFN Manufacturing panel linked with deployed custom attributes in order to be exported in Excel.
Based on what reported on KB article QA00000066540, I'm able to get new columns on Manufacturing panel, but unfortunately they are empty.
My feeling is that dicoType is wrong, but I have no idea of which type is correct for the four type managed by MFN: MA, PV, MM, MK..
Anybody has idea?

Thanks,
Mauro