Source: dupatch deletion.
Problem: An attempt to remove patches fails because the file /var/adm/patch/versionswitch.txt is not available to dupatch.
Cause: At least one of the patches selected for deletion in dupatch has a version switch associated with it (defined by having the attribute PATCH_REQUIRES_VERSION_SWITCH set to "Y" in its patch.ctrl file). The versionswitch.txt file is necessary to determine whether the version switch has been thrown.
Action: The dupatch utility returns to the main menu. In order to proceed with the delete operation, you need to determine if the version switch was updated. If it has been thrown, you must run the undo script included with the patch to enable patch deletion (see “Removing Patches Installed During a Rolling Upgrade”). If the switch has not been thrown, you can enable the deletion of this patch by reconstructing the versionswitch.txt file. You can also reselect patches for deletion, omitting the patch containing the version switch.
Contact your Customer Service Representative for assistance.
/var/adm/patch/versionswitch.txt file not found!
Cannot delete patches selected since patch_ID requires a version switch.
Please reselect patches or resolve missing /var/adm/patch/versionswitch.txt
Please contact your Customer Service Representative for assistance.