transfer asset within company code (ABUMN) why does acc. depre. not correct

when i run asset report (date 31.07.2007) asset 240004600601 value 89,028.00 acc. depre. 73,173.71

but when i want to transfer value from asset 240004600601 to asset 810185000002 by use T-code ABUMN

i used doc. date 01.08.2007 , asset value date 01.08.2007

when i press simulate it's transfer acc. depre. 73,173.70 (it's should be 73,173.71)

what should i do?

please tell me