Diagnosis
You selected a rectangular section of the screen. The position and sizeof the section are determined by the current cursor position.
Part of a checkbox or radio button intrudes into the section but theother part remains outside. For example, the section contains a radiobutton, but not the associated field text.

System Response
The system cannot decide which fields belong to the section andtherefore rejects the section in this size.

Procedure
Place the cursor in another position on the screen and chooseSelect area end.