build-src goal use predefined src field, not sourceDirectory

When I run maven dist:build-src I get product-src.zip containing only build.xml, LICENSE.txt, project.properties and project.xml.
No files from sourceDirectory is taken.
If I move all contents of my sourceDirectory (Source/java) to src in project root directory everything is OK.

I suppose that maven is always taking default location (src) and do not change it with value from /project/build/sourceDirectory.

PS. Other actions like compiling, jar, javadoc are working perfect, so it should not be a problem with my project.xml and mavem.xml.