Hi
a posting to a fixed asset initially causes the planned depreciation to change in asset accounting, but this planned depreciation is not updated financial accounting (GL) until the periodic depreciation Posting run is executed. In other terms in will show only in Account Accounting. The posting run of depreciation (AFAB) is executed periodically and at that time the GL accounts are updated as follows
DR Depreciation A/C (P&L)
CR Accumulated Depreciation A/C (balance sheet)
The GL account is determined based on the account assignment which is a configuration (Ao90). Hence when you run a P/L at the month end you can see the depreciation posted for that period at each GL level. This can be viewed even at cost center Reports.