eed3si9n/scalaxb — pull request #274 by plaflamme (2014-08-19 14:30:42+00:00)
Title: FIX: multipart message with header parts.

This is probably not how you may want to fix the issue, but this is sufficient to fix my problem (as per https://groups.google.com/d/msg/scalaxb/cDUWnim1vbY/B00GqK9kidoJ)