RMAN CPU time accounts also to background time in dba_hist_sys_time_model ?

HallO Listers,
I am trying to generate some report showing how much CPU time is consumed 
from RMAN.
I have found that normally background precesses (as per dba_hist_sys_time_model 
view) consume 20-100 seconds (in  30 minutes interval). But when RMAN backup is 
running the background cpu time is nearly
RMAN CPU time + background CPU time (see below). That means that 
RMAN CPU time is double accounted in dba_hist_sys_time_model view ?! 
Can someone confirm my observation ?

Here is the output of my script:

                    ELAPSED     DB   RMAN  BGRND
  SNAP        BEGIN    TIME    CPU    CPU    CPU
    ID         TIME   [sec]  [sec]  [sec]  [sec]
------ ------------ ------- ------ ------ ------
  9421 21/01 09:01     1740    446      0      8
  9422 21/01 09:30     1800   1006      0     15
  9423 21/01 10:00     1860     39      0      6
  9424 21/01 10:31     1740   2171      0     79 -> normal CPU consumption
  9425 21/01 11:00     1800   5178      0    219
  9426 21/01 11:30     1800   2978   8326   8408 -> 8408 -8326 = 82 sec 
  9427 21/01 12:00     1800   1588   4893   4915 -> the same 
  9428 21/01 12:30     1860     30    445    459
  9429 21/01 13:01     1740    400      1     17
  9430 21/01 13:30     1800    405      0     12
  9431 21/01 14:00     1860    297      0      6
 

Any help is highly appreciated.

MILEN 
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