Depreciation and Cost Center

Dear Expert,

I want to understand, that how the depreciation is getting posted to various cost center.

we would have single GL for depreciation of particular assets class i.e. Dep for P & M, but still when we post the depreciation system pick ups the different Cost center. is it because of we have different cost center at assets master.

I would like to know the configuration t codes for AA-CO.

Please help