How to Assign the Salvage Value 1 if the Assets is fully Depriciated

Dear,

We have some of the assets which are fulll depriciated and net book value is "0", but now user said they need net book value "1" with those assets are fully depriciated now how I can resolved this problem. when I try to enter the salvage value 1 then I got the error messgae "You cannot assign the salvage value greater then the net book value".

 

Please advise.

Thanks