The network command controls what are originated by your router.
Its not like when your running OSPF on an interface, and try run BGP on a specific interface. The network command will only work if the network you are trying to advertise is known to the router, whether connected, static or learned dynamically.
This also a way to advertise many small subnets as bigger subnet.
Even though you have the network defined under BGP, BGP will not advertise a network unless the network exists in it's routing table. Hence the static route. This is to prevent black holes. That function can be disabled by putting the "no sync" command under BGP.
BGP will not advertise any network unless there is an exact match in the routing table learn either via an IGP or by configuring static route as you did in your case. To verify it you can do the show command " show ip bgp neighbor < ip address > advertised-routes" and that will tell you the networks your router my-ASBR advertising. Hope this helps.
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