Dears,
i found the solution. i created a custom profille on o2cl and in default values tab, i chose No radio button for default values copy. then assigned it to my user. The SAPPROFILE actually allows default values to be copied if a characteristic data is not sent.
This time when i create a classification, data is as expected. characteristics not sent have blank value and not default value.
Thank you for your time Image may be NSFW.
Clik here to view. have a good day.
Char