Nerocmd multisession

nero v6 with dvd+r

am trying to continue the session from the last track on a dvr+r and add files to the dvd using nerocmd:
–drivename e
–iso acct

this will copy the files and continue a multisession track created with the NERO program GUI, but this session can not be continued. the volume label is changed from acct to new

the NERO program GUI indicates the track was not created using nero’s multisession option.

it is big trouble here at work.
any help/thoughts/info is appreciated.

john bosco