At the time of Change Useful life in Asset

Hi All,

At the time of Change the useful life in the asset master --

Exam. We have one asset that asset useful life has set at the time of create asset master 999 now at per company act it will be change now we try to change.

what is the system em pct i do n't no.

and what we have to set in the asset master remaining useful life OR asset useful life.

Please help me to resolve this issue.

Regards,

Juhis