Problem printing with Xerox CopyCenter 238 using manufacturer PPD

Hi,

I'm printing using CUPS over ipp to a Xerox CopyCenter 238 using
the .ppd file included in this package [1] The driver is working well
except for an error that appears in the Printer configuration page
(translated from Italian):

Error: the following options are in conflict:
Transparency Separator
Colors

apparently this error prevents me to change any other printer option.
I looked into the .ppd file and I found the following [2] Anybody
knows a mean to overcome the problem?

Thanks in advance
Jimmi

[1]http://www.support.xerox.com/go/getfile.asp?
Xlang=it_IT&XCntry=ITA&objid=61717&EULA=1&prodID=WC232_WC238&Family=WorkCentre&ripId=&langs=Italiano&plats=Windows
%20Vista,Windows%20Server%202003%20x64,Windows%20Server%202003,Windows
%20XP%20x64,Windows%20XP,Win.%20XP%20Embedded,Windows%202000,Windows
%20Me,Windows%2098,Windows%2095,Windows%20NT%204.0,Windows%20NT
%203.5x,Windows%20NT%203.1,Windows%203.1x,Windows%203.x,MS-
DOS,Macintosh%20OS%20X,Macintosh%209,Macintosh%208,Macintosh
%207,UNIX,Sun%20OS,Sun%20Solaris,Linux,IBM%20OS/2,IBM%20AS/400,SAP%20R/
3,DEC%20Alpha&Xtype=download&uType=

[2]
*%
============================================================================
*% Interleave Type
*%
============================================================================
*JCLOpenUI *Interleave/Transparency Separators: PickOne
*OrderDependency: 16 JCLSetup *Interleave
*DefaultInterleave: None
*Interleave None/No Separators: "%%OID_ATT_INTERLEAVE
OID_VAL_INTERLEAVE_NONE;"
*End
*Interleave Blank/Blank Separators: "%%OID_ATT_INTERLEAVE
OID_VAL_INTERLEAVE_BLANK;"
*End
*Interleave Imaged/Printed Separators: "%%OID_ATT_INTERLEAVE
OID_VAL_INTERLEAVE_IMAGED;"
*End
*JCLCloseUI: *Interleave

*%
============================================================================
*% Interleave Media Color
*%
============================================================================
*JCLOpenUI *InterleaveColor/Colors: PickOne
*OrderDependency: 17 JCLSetup *InterleaveColor
*DefaultInterleaveColor: White
*InterleaveColor White/White: "%%OID_ATT_INTERLEAVE_COLOR \"White\";"
*End
*InterleaveColor Buff/Buff: "%%OID_ATT_INTERLEAVE_COLOR \"Buff\";"
*End
*InterleaveColor Blue/Blue: "%%OID_ATT_INTERLEAVE_COLOR \"Blue\";"
*End
*InterleaveColor Gray/Gray: "%%OID_ATT_INTERLEAVE_COLOR \"Gray\";"
*End
*InterleaveColor Green/Green: "%%OID_ATT_INTERLEAVE_COLOR \"Green\";"
*End
*InterleaveColor Ivory/Ivory: "%%OID_ATT_INTERLEAVE_COLOR \"Ivory\";"
*End
*InterleaveColor Orange/Orange: "%%OID_ATT_INTERLEAVE_COLOR \"Orange
\";"
*End
*InterleaveColor Clear/Clear: "%%OID_ATT_INTERLEAVE_COLOR \"Clear\";"
*End
*InterleaveColor Other/Other: "%%OID_ATT_INTERLEAVE_COLOR \"Other\";"
*End
*InterleaveColor Pink/Pink: "%%OID_ATT_INTERLEAVE_COLOR \"Pink\";"
*End
*InterleaveColor Red/Red: "%%OID_ATT_INTERLEAVE_COLOR \"Red\";"
*End
*InterleaveColor Yellow/Yellow: "%%OID_ATT_INTERLEAVE_COLOR \"Yellow
\";"
*End
*InterleaveColor Goldenrod/Goldenrod: "%%OID_ATT_INTERLEAVE_COLOR
\"Goldenrod\";"
*End
*InterleaveColor Unspecified/Any Color: "%%OID_ATT_INTERLEAVE_COLOR
\"Unspecified\";"
*End
*InterleaveColor Custom1/Custom 1: "%%OID_ATT_INTERLEAVE_COLOR
\"Custom1\";"
*End
*InterleaveColor Custom2/Custom 2: "%%OID_ATT_INTERLEAVE_COLOR
\"Custom2\";"
*End
*InterleaveColor Custom3/Custom 3: "%%OID_ATT_INTERLEAVE_COLOR
\"Custom3\";"
*End
*InterleaveColor Custom4/Custom 4: "%%OID_ATT_INTERLEAVE_COLOR
\"Custom4\";"
*End
*InterleaveColor Custom5/Custom 5: "%%OID_ATT_INTERLEAVE_COLOR
\"Custom5\";"
*End
*InterleaveColor Custom6/Custom 6: "%%OID_ATT_INTERLEAVE_COLOR
\"Custom6\";"
*End
*InterleaveColor Custom7/Custom 7: "%%OID_ATT_INTERLEAVE_COLOR
\"Custom7\";"
*End
*JCLCloseUI: *InterleaveColor

.