I am trying
to use the Call statement to invoke a function that displays
information in a popup window. How can I avoid getting the error
message
'GuiXT Call RFC Error' with the description 'Screen output without
connection to user'?
Put
a statement
Call
Function "SYSTEM_ATTACH_GUI".
into
your function module. This, by the way, also enables normal ABAP
debugging
of the called function (via a BREAK-POINT).