Modeling rules for role-based Enterprise BPMN collaboration diagrams
The model contains no pool.
The model contains pools without lanes.
The model contains a pool that contains process steps which belong to different processes.
The model contains nested lanes.
The model contains lanes that are outside a pool.
The model contains a pool whose orientation (vertical or horizontal) does not match that in the target diagram.
The model contains elements that are placed outside of lanes (except annotations).