When inheriting rules, the order they are written to DRL counts.

dward noticed this when using Guvnor. There is no way to control the order of the rules in Guvnor, so because of this inheritance doesn't always work.

This works:
rule A
when
...
then
end

rule B extends A
when
...
then
end

This doesn't work:
rule B extends A
when
...
then
end

rule A
when
...
then
end