ggbreak with legend position manually setup

[yaqinguo]

can someone help me with the following issues: when I use scale_y_break, how I can customize my legend position?
ggplot(data,aes(x,y,fill))+
geom_bar()+
facet_grid()+
theme(legend_position=c(0.9,0.6))+
scale_y_break(c(3,7),scale=1,expand=F)
I got the following the warning messages:
1: Manual legend position not possible for collected guides. Defaulting to 'right'
2: Manual position of collected guides not supported