add warning before source attribute
add warning before source attribute

pax95/camel,tdiesler/camel,apache/camel,DariusX/camel,tadayosi/camel,tdiesler/camel,DariusX/camel,alvinkwekel/camel,tadayosi/camel,apache/camel,christophd/camel,alvinkwekel/camel,pax95/camel,adessaigne/camel,gnodet/camel,gnodet/camel,pmoerenhout/camel,nicolaferraro/camel,DariusX/camel,christophd/camel,gnodet/camel,pax95/camel,gnodet/camel,pax95/camel,cunningt/camel,tdiesler/camel,mcollovati/camel,pmoerenhout/camel,cunningt/camel,cunningt/camel,cunningt/camel,cunningt/camel,adessaigne/camel,adessaigne/camel,adessaigne/camel,nikhilvibhav/camel,christophd/camel,apache/camel,pax95/camel,tdiesler/camel,nicolaferraro/camel,alvinkwekel/camel,tdiesler/camel,adessaigne/camel,christophd/camel,tadayosi/camel,tdiesler/camel,alvinkwekel/camel,christophd/camel,DariusX/camel,pax95/camel,tadayosi/camel,gnodet/camel,adessaigne/camel,nicolaferraro/camel,mcollovati/camel,pmoerenhout/camel,pmoerenhout/camel,pmoerenhout/camel,nikhilvibhav/camel,apache/camel,tadayosi/camel,nikhilvibhav/camel,mcollovati/camel,pmoerenhout/camel,cunningt/camel,tadayosi/camel,apache/camel,nikhilvibhav/camel,christophd/camel,mcollovati/camel,nicolaferraro/camel,apache/camel