Part of the 10.2.3.1 Software includes an addition to Main System Configuration Page. The option to either Enable or Disable Approach Roll Steering.
Revision 17 of the Installation Manual did not include a description of this setting and it's defined purpose. Until the Installation Manual is update this configuration setting should be set as follows:
Approach Roll Steering
Enabled: Default setting.
Disabled: Invalidates GPSS Roll Steering output during FMS approaches. Should be disabled for autopilots that fly GPSS during approach mode to force the autopilots to switch to Left/Right deviation data.