Changing Key Figure Property !

Dear Experts,

I dont have immediate access to sandbox. Could you confirm if I change a key figure's property e.g. making it to input and output from output only in a productive planning book, what could be the risk. I am talking of a production system.

On the same lines if I change the input horizon in data view (that again initializes the planning area), what could be the risks. e.g. risk of data loss or inconsistencies.

Thanks for your responses.

Guru