Writing free text is available in Analyzer but can't be done by Analysis Office by IP

Hi Experts

I created a characteristic without master data and text. This characteristic is used to store comments during planning. I can use BEx Analyzer write free text into this characteristic by IP(Integrated Planning). But I can't do this in Analysis Office. Is there anyone know how I can do this in AO?

And I'm using BW710, AO 1.4.

Thanks.