How to handle manual depreciation

Dear all my friends,

as i know, SAP provide depreciation function automatically.

but, i have a case need to set exactly depreciation amount differ with sap calculated value.

so, how can i process this case.

i heart that, there is a function call as manual depreciation.

please help to guide me step by step how to do...

for ex : sap calculate next depreciation amount = 100

but, i would like to post 110 as next depreciation amount.

thanks !