Expired life of the asset in periods not updating

Hi Experts,

Could any one explain us, how the expired life of the asset updates in periods?

I have checked in ANLC and ANLB tables, it updates only in years. Say for example, Life of an asset is 10 years and expired is 10 months. Here we want to know, where the system updated the periods of remaining life as 110. (10 X 12=120 periods -10 periods (expired life)= 110 periods.)

Looking for your valuable information.

Regards,

Chandu