Error reported for bundle projects: Conflicting lifecycle mapping metadata

With a locally built Sling IDE 1.2.0 and the locally checked out Sling bundles I get the following kind of errors:

Conflicting lifecycle mapping metadata (project packaging type="bundle"). To enable full functionality, remove the conflicting mapping and run Maven->Update Project Configuration.

This one is for example for org.apache.sling.api . I do have Tycho Project Configurators 0.8.0.201409231215 installed. I'll attach my configuration details, if needed.

The whole Sling checkout is at r1768748.