BGP is clever (% BGP : incorrect network or mask configured)

Do you know why BGP is clever, she is know if I input incorrect network or mask :D
why she, cause' BGP is beautiful ;;)

Router(config-router)#net 1.1.8.8 mask 255.255.255.0
% BGP: Incorrect network or mask configured

Router(config-router)#net 1.1.8.0 mask 255.255.255.0

Router(config-router)#do sh ip int b | i 1.1.8.8
Loopback0              1.1.8.8       YES NVRAM  up                    up