Yearfolder uses unspecified workflow

The workflow opengever_yearfolder_workflow exists in https://github.com/4teamwork/opengever.core/blob/master/opengever/inbox/profiles/default/workflows/opengever_yearfolder_workflow/definition.xml .
**But he is not specified in the workflow.xml** which results in an error on submitting the /portal_workflow/manage_selectWorkflows form.
https://github.com/4teamwork/opengever.core/blob/master/opengever/inbox/profiles/default/workflows.xml#L15

Does the yearfolder use opengever_yearfolder_workflow?