This object specifies the value of entPhysicalIndex of the
physical entity for which the on demand Call Home messages
should be generated.
Only those entities which support generation of on demand
Call Home messages may be specified for this object.
The value of this object should be ignored if alert group
specified by ccmOnDemandMsgSendAlertGroup does not have
'onDemandPerEntity' capability.
Value of this object should be ignored if the value of
ccmOnDemandMessageType is other than 'alertGroup'.