How to upgrade a multiple instance TSM server on AIX

Hi *SM-ers!
We have an AIX 5.2 server with two TSM instances running on the same AIX
partition.
We have upgraded the first instance, changed the link to the second
instance's install path and rerun SMIT INSTALL to upgrade this instance.
The first upgrade runs fine, but I cannot find a way to upgrade the
second instance. In SMIT I have selected the following options:

INPUT device / directory for software                   .
SOFTWARE to install
[tivoli.tsm.server.rte>
PREVIEW only? (install operation will NOT occur)                yes
COMMIT software updates?                                yes
SAVE replaced files?                                    no
AUTOMATICALLY install requisite software?               no
EXTEND file systems if space needed?                    yes
OVERWRITE same or newer versions?                       yes
VERIFY install and check file sizes?                    no
DETAILED output?                                        no
Process multiple volumes?                               yes
ACCEPT new license agreements?                  no
Preview new LICENSE agreements?                 no

This upgrade fails with the following error:

Force Apply Failures
--------------------
The following is a list of fileset updates.  Updates cannot be specified
from the command line when the force flag (-F) is used in combination
with the apply flag (-a).

How can I upgrade the second instance when apparently you cannot do a
force install when you install an update??
Thank you very much for any reply in advance!
Kindest regards,
Eric van Loon
KLM Royal Dutch Airlines


**********************************************************************
For information, services and offers, please visit our web site: 
http://www.klm.com. This e-mail and any attachment may contain confidential and 
privileged material intended for the addressee only. If you are not the 
addressee, you are notified that no part of the e-mail or any attachment may be 
disclosed, copied or distributed, and that any other action related to this 
e-mail or attachment is strictly prohibited, and may be unlawful. If you have 
received this e-mail by error, please notify the sender immediately by return 
e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), 
its subsidiaries and/or its employees shall not be liable for the incorrect or 
incomplete transmission of this e-mail or any attachments, nor responsible for 
any delay in receipt.
Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch 
Airlines) is registered in Amstelveen, The Netherlands, with registered number 
33014286 
**********************************************************************