Override maven 3.0.3 in intellij when generating sources

It appears intellij uses maven 3.0.3 internally when generating sources.

I have tried overriding this in the usual settings but it doesn't appear to have any effect on this issue.

We have a plugin that is used to generate sources that unfortunetly explicitly requires maven 3.0.4.

Is there anyway of changing the version of maven used internally within intellij ?

Thanks