Ant 'presetdef' breaks validation?

I have an Ant buildscript that makes use of the PreSetDef Task. IntelliJ (14.1.4) appears to be struggling with it.

In the screenshot below, you can see that the IDE does regonize the pre-set: it's name "my.javac" is colored blue. However, any overrides are not recognized at all (colored red). The tooltip reads: "Element src is not allowed here"

This happens for pretty much all child elements of the preset. When I use auto-complete, only three child element suggetions pop up:

• ant-project
• context-ant-project
• declaring-element

Only these two attributes appear to be valid

• id
• refid

I would expect that all child elements and attributes that are valid on the 'original' javac task are valid. What am I missing here?