set protocols bgp system-as '65550'
...
set protocols bgp neighbor 198.51.100.99 address-family ipv4-unicast route-reflector-client
set protocols bgp neighbor 198.51.100.99 address-family ipv4-unicast soft-reconfiguration inbound
set protocols bgp neighbor 198.51.100.99 address-family ipv4-unicast weight '32769'
set protocols bgp neighbor 198.51.100.99 description 'TEST'
set protocols bgp neighbor 198.51.100.99 remote-as '65550'

Traceback (most recent call last):
  File "/usr/libexec/vyos/conf_mode/protocols_bgp.py", line 666, in <module>
    verify(c)
  File "/usr/libexec/vyos/conf_mode/protocols_bgp.py", line 480, in verify
    if peer_group_as is None or (peer_group_as != 'internal' and peer_group_as != bgp['system_as']):
       ^^^^^^^^^^^^^
UnboundLocalError: cannot access local variable 'peer_group_as' where it is not associated with a value