ppd -illegal main keyword string

[zuecks at gmx.de]

Ive tested the ppd from my new HP-color-laserJet 4650
cupstestppd -v HPC4650S.ppd
**FAIL** Unable to open PPD file - Illegal main keyword string on line xx

The reason could be the lenght from keyword string.The Adobe ppd-Description Fileformat-Specification declare that keyword string should be not longer as 40 character.

*DefaultHPColorSmart_Graphics_NeutralGrays: Default_BlackOnly

You can see, the string are 41 characters.
How can I change the ppd that cups accept this??
Maybe can anyone help ?

Frank