Comments have in first line a date the reminder null

[#1]

HI Community,

I want that the Comments which has the same "LaufendeNr"(EntryNR) get the "Datum" from first Line which is given in the database.

LaufendeNr	Kommentar	Datum
21501	es stehen Verhandlungen an	14.03.2012
21501	Kommentar 2 Test	01.01.1753
21501	Test 3	01.01.1753
1959 usw..	...	....

That is: all the 3 lines with the LaufendeNr(EntryNo) "21501" must have the Datum "14.03.2012".

(01.01.1753 is a Null Value if there are no date for this line in database.)

At the end, i want to achieve that all Comments with the same LaufendeNr are displayed in a TextBox : Commnt1,Comment2,Comment3 with this Expression

FirstSortedvalue(Kommentar, -Datum).

You must still do something with concat?

Thanks!!!!!!!