IP change Characteristic user change

Hi Experts,

I have a Incube Real-time, and Aggreagation Level, a Query on it, With some Input Field, Now I want to change 2 charateristics (0user and 0ch_on), with sy-datum and sy-uname when some user change the input fields.

But I don't want to do that in Fox Formula.

With Exit class, but I didn't work...

I already tried 2 how to...

How to... Run planning functions on changed record in SAP Netwever BW Integrated Planning

How to... Flexibly change Characteristic Values and comments in BI Integrated Planning

Do you know How I can do that ?

Thanks..