The BGP neighbor Command Caveat

Router#sh ver | in IOS
IOS (tm) 3600 Software (C3620-I-M), Version 12.3(26), RELEASE SOFTWARE (fc2)
Router#
Router#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#router bgp 100
Router(config-router)#neighbor 22.22.22.22 remote-as 200
Router(config-router)#neighbor 33.33.33.333 remote-as 300
% Create the peer-group first
Router(config-router)#
Router(config-router)#neighbor 33.33.33.33 remote-as 300
% Create the peer-group first
Router(config-router)#
Router(config-router)#exit
Router(config)#
Router(config)#router bgp 100
Router(config-router)#neighbor 44.44.44.44 remote-as 400
% Create the peer-group first
Router(config-router)#
Router(config-router)#exit
Router(config)#no parser cache
Router(config)#
Router(config)#router bgp 100
Router(config-router)#neighbor 33.33.33.33 remote-as 300
Router(config-router)#neighbor 44.44.44.44 remote-as 400
Router(config-router)#