How to simulate asset transaction in future

Hi Friends,

can someone advise how to simulate posting of transaction i.e. in next year? I mean in asset explorer simulation is not possible unless you have the period opened for posting in FI.

Is it possible without opening the period i.e. for year 2010 ? Or is there any other way how to calculate future depreciation amount for example for year 2010 with subseq. acquisition in 11/2009. Do hope there is some program in SAP, or do you know some external tool i.e. via Excel...?

Thank you for answers!