To modify a contact person, open the contact person and then click on 'Modify.' Please see the image below.
Now you can make changes to the data as needed. If you choose 'Save in the meantime,' all data will be saved while the window remains open. To save definitively when you're done, choose 'Save.'
By clicking 'Cancel' or the "X" in the upper right corner, you can return to the contact person field without saving any new data.
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