Validation fails when a project imports a reusable recipe

[vincent-zurczak]

A configuration file could not be read.
File: /home/vzurczak/workspaces/open-paas/cassandra-example/src/main/model/graph/cassandra-cluster/main.graph	main.graph

/cassandra-example/src/main/model/graph

Sure, the file is under the target directory.