Increasing Keyfigure length in Production System

Hi Experts,

I want to increase the length of a keyfigure (standard infoobject) from 3 to 5. The keyfigure is used in multiple targets of production system.

I am planning to change the domain associated with the keyfigure with a custom domain and change the entries in RSDKYF table.

But i am worried about the data which is already loaded in data targets.I just want to keep the old data as such and load future data with required decimal places.

I am not in a position to think about reloading.

Please suggest the consequences of increasing the keyfigure length.Will it work perfectly if i transport the custom domain and the keyfigure to the production system.

Thanks,

Minu