Thanks for reporting this problem, which I believe has not been reported previously.
Unfortunately the project engineer who has expertise with Contacts Migration is on vacation until early February. It could take some time to determine the cause.
In the meantime, please send your Formativ configuration to firstname.lastname@example.org. You can obtain the configuration by selecting Help | About Formativ… from the GroupWise main menu. When the About Formativ dialog appears, go to the Configuration tab and click the button Copy to clipboard. Then paste the text into your reply email (or save it to a plain-text file and include it as an attachment).