How to set up a default answer that depends on a calculation

I want to create a decimal question with a default answer set with the result of a calculation (the idea is that the respondent will just check if the number is correct).

I created my calculate question named prix_prod, which is working fine, and I tried writing ${prix_prod} in the default column for my decimal question. But when I do a preview of the form, the answer field of the decimal question stays blank. Do you have a solution?

Thank you !, kindly please be informed that as of now, the default will only support the stagnant value and does not support the dynamic value.

Ok, thanks for your answer