samba - Feb 2010 - call_nt_transact_ioctl(0x900eb): Currently not implemented

Hopefully some one can help me wit this.  
 
I run ubuntu 8.04 server 64 bit edition as a local file and print server.  I
use samba to act as an NT server for 6 XP pro clients running MS Access
database.  In my log files I consitanty have the following error which seems
to occur when there is more that one user accessing the database:
 
Feb 27 11:36:24 fileserver smbd[11192]: [2010/02/27 11:36:24, 0]
smbd/nttrans.c:call_nt_transact_ioctl(2463) 

Feb 27 11:36:24 fileserver smbd[11192]:   call_nt_transact_ioctl(0x900eb):
Currently not implemented. 


Despite this error there seems to be no effect on performance.  I have
googled around and seen the same arror reported before but no definative
answer.
 
Thanks
 
My smb.conf
[global]
 log file = /var/log/samba/log.%m
 load printers = yes
 name resolve order = bcast host lmhosts wins
 socket options = SO_KEEPALIVE TCP_NODELAY IPTOS_LOWDELAY SO_SNDBUF=8192
SO_RCVBUF=8192
 interfaces = eth1 lo
 hosts allow = 135.120.135.1, 135.120.135.2, 135.120.135.3, 135.120.135.4,
135.120.135.5, 135.120.135.6, 135.120.135.7, 135.120.135.8, 135.120.135.9,
135.120.135.10
 encrypt passwords = true
 password level = 8
 dns proxy = No
 netbios name = FileServer
 cups options = raw
 server string = 
 printing = cups
 kernel oplocks = no
; veto oplock files = /*.mdb/
 local master = yes
 workgroup = WORKGROUP
 os level = 65
 hosts deny = ALL
 printcap name = cups
 security = user
 bind interfaces only = yes
smb ports = 139
# oplocks = false
 
[printers]
   comment = All Printers
    path = /var/spool/samba
   browseable = no
# to allow user 'guest account' to print.
    guest ok = yes
    writable = no
    printable = yes
    create mode = 0700
 
[print$]
   path = /var/lib/samba/printers
   browseable = yes
   read only = yes
   write list = root
 
# A useful application of samba is to make a PDF-generation service
# To streamline this, install windows postscript drivers (preferably 
# colour)on the samba server, so that clients can automatically install
# them.
 
;[pdf-generator]
;   path = /var/tmp
;   guest ok = No
;   printable = Yes
;   comment = PDF Generator (only valid users)
   #print command = /usr/share/samba/scripts/print-pdf file path win_path
recipient IP &
;   print command = /usr/share/samba/scripts/print-pdf %s ~%u
\\\\\\\\%L\\\\%u %m %I &
 
# Case Preservation can be handy - system default is _no_
# NOTE: These can be set on a per share basis
;  preserve case = no
;  short preserve case = no
# Default case is normally upper case for all DOS files
;  default case = lower
# Be very careful with case sensitivity - it can break things!
;  case sensitive = no
 
# a service which has a different directory for each machine that 
# connects this allows you to tailor configurations to incoming 
# machines. You could also use the %u option to tailor it by user name.
# The %m gets replaced with the machine name that is connecting.
;[pchome]
;  comment = PC Directories
;  path = /usr/pc/%m
;  public = no
;  writable = yes
 
;[homes]
; comment = Home Directories
; read only = No
; browseable = No
 
[Adrian]
 comment = Adrians Files
 path = /media/disk/adrian
 valid users = adrian, consulting
 read only = No
 create mask = 0777
 force create mode = 0777
 directory mask = 0777
 force directory mode = 0777
 
[Music]
 comment = MP3s etc
 path = /media/disk/music
 read only = No
 guest only = Yes
 guest ok = Yes
 create mask = 0777
 force create mode = 0777
 directory mask = 0777
 force directory mode = 0777
;force user = reception
 
[Staff]
 comment = Staff Files
 path = /media/disk/staff
 valid users = adrian, reception, dispensing, imaging, office, consulting
 read only = No
 create mask = 0777
 force create mode = 0777
 directory mask = 0777
 force directory mode = 0777
force user = reception
 
[Focus Data]
 writeable = yes
 path = /media/disk/focus_data
 force directory mode = 0777
 force create mode = 0777
 force user = reception
 comment = Data files for Focus and Clinical Records
 valid users adrian,reception,dispensing,imaging,office,consulting, at allhosts
 create mode = 0777
 directory mode = 0777
veto oplock files = /*.*/
 
[Practice Documents]
 comment = Practice documents and files
 path = /media/disk/practice_documents
 valid users = adrian, reception, dispensing, imaging, office, consulting
 read only = No
 create mask = 0777
 force create mode = 0777
 directory mask = 0777
 force directory mode = 0777
force user = reception
 
[HoyaLog]
 comment = HoyaLog files
 path = /media/disk/hoyalog
 valid users = adrian, dispensing, office
 read only = No
 create mask = 0777
 force create mode = 0777
 directory mask = 0777
 force directory mode = 0777
;force user = reception
 
[Clinical Images]
 comment = Clinical image files
 path = /media/disk/clinical_images
 valid users = adrian, imaging, office, consulting
 read only = No
 create mask = 0777
 force create mode = 0777
 directory mask = 0777
 force directory mode = 0777
;force user = reception
 
[SAGE]
 comment = SAGE accounts files
 path = /media/disk/sage
 valid users = adrian, office, consulting
 read only = No
 create mask = 0777
 force create mode = 0777
 directory mask = 0777
 force directory mode = 0777
;force user = reception
 
[Drivers_etc]
 comment = Windows drivers & device settings
 path = /media/disk/drivers_etc
 valid users = adrian, reception, dispensing, imaging, office, consulting
 read only = No
 create mask = 0777
 force create mode = 0777
 directory mask = 0777
 force directory mode = 0777
force user = reception