The version in the workspace stream is the same as the version in the backing stream.
(overlap)
The element has changed in this stream and in the parent stream. Overlap elements require a merge operation before you can
promote changes to the parent stream. Overlap elements are displayed with a yellow highlight.
(underlap)
The element has changed in this stream and in the parent stream, however the parent stream already contains the changes in
this workspace or stream. In many cases, it is most appropriate to remove your changes from this workspace stream. In other
cases, you can merge and promote, just as with an overlap element.