Long Text in 4.0B

[Alon Raskin]

I have a customer that is on 40B currently. When I insert a multi-line
container element into the long text of a task. I then prompts me as to how
I would like the data displayed.
 
If I select only first line then I have no problem. However, If I select All
lines (with or without line breaks) I get an error that says that that my
attribute is not allowed (Message WZ 611). I cant find anything on OSS or
WugArchive.com .
 
Any ideas?
 
Alon