The Details list in the UCM Deliver window shows the following items:
One of the following icons (similar to those used by the Windows NT Event Viewer) appears to indicate the status of the latest Rational® ClearCase® operation that was performed on that element.

Each icon corresponds to a status of the latest message returned and recorded in the element log for that element.
Indicates whether the element merged successfully (Yes) or did not (No).
If elements are not merged, check the element logs, fix the problems, select the unmerged elements in the Details list, and re-try the operation.
An element can show Merged as Yes but Checked-out as No. This is not a problem, because sometimes an element does not actually require a merge, is not checked-out, but is marked as merged.
Indicates whether the element is checked out and, if it is checked out, shows its status (reserved or unreserved) and mastership (with Rational ClearCase MultiSite).
You want to ensure that all elements are marked as Yes under Merged. At that point, the merge is considered complete and you are ready to test the elements in the integration view before you complete the deliver operation.