Report prompt in derived table

Hi everyone,

I am currently building a report which uses a derived table (found in data foundation) and normal queries on BO.

Now I want to create a prompt for users to enter a mobile number but I want this prompt to appear only once when the report is refreshed.

If I include the same prompt with the same exact name in the derived table and in the report will I have only 1 prompt when the report is refreshed? Do you think this will work?

On DeskI 3.1 it used to work for me, not sure on WebI 4.1 as I'm new to it.

Thanks!