Cannot use ports in field "Item Input" of TextDisplay in operator panels
AF3 does not accept port names as item input. Instead it replaces the
port name with “var”.
Only constants, such as “0” or elements from the data dictionary are
accepted.
See attached screenshot for the situation after trying to write a port
name.
(from redmine: issue id 1379, created on 2013-05-03, closed on 2014-05-15)