How do I change the acquisition date of a subsidiary?

Navigate to the group tool. Click on "Settings" and then "Acquisition analysis". Then click on the name of the group company.

If the acquisition analysis is locked, it must be unlocked first. Click on the "Lock acquisition analysis" tab, then click the "Unlock acquisition analysis" button.

You can now change the acquisition date. Click on the "Summary" tab and modify the "Purchase date".

Once you have changed the date, you can lock the acquisition analysis again. Click the "Lock acquisition analysis" tab and click the "Lock acquisition analysis" button.