Error - while changing Ethernet Heartbeat detection ratio

Error while changing Ethernet Heartbeat detection ratio
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IBM recommendation...they asked us to set values as below :-

ethernet network, change FDR to:
Failure cycle = 4
Heartbeat rate = 15
Formula calculation
4*15*2 = 120 seconds   

diskHeartbeat network, change FDR to:
Failure cycle = 6
Heartbeat rate = 10
Formula calculation
6*10*2 = 120 seconds

We were able to change to the said Disk HB settings....
but for Ethernet HB...smitty didn't allow us to go beyond a value of 10 for HB Rate.
We got the below error....so we set ethernet HB to same values as Disk HB (ie) 6*10

  Failure Cycle                                      [4]                                                                                             #
  Interval between Heartbeats (seconds)              [15]
Heartbeat rate is the rate at which cluster service

ERROR

Before command completion, additional instructions may appear below.

topsvcs: 2523-890 ERROR:  Network type: ether
  The value 15000000 for the heartbeat rate is out of range.
  The value should be at least 200000 and no more than 10000000.

In the IBM documents its shown that Max value for HB Rate is 5.

Failure Cycle
The current setting is the default for the network module selected. (Default for Ethernet is 10). This is the number of successive heartbeats that can be missed before the interface is considered to have failed. You can enter a number from 1 to 75.

Interval between Heartbeats (seconds)
The current setting is the default for the network module selected and is a heartbeat rate. This parameter tunes the interval (in seconds) between heartbeats for the selected network module. You can enter a number from less than 1 to 5.