help/webi - find value corresponding to maximum datetime/seq. in group of values

Hello,

WebI 4.0 Sp6, Data in SQL Server, using *.unx universes

My Data Looks like this.

***********************
S.No.      Group      seq      datetime

A123      M           1           01/02/2014 12:00:00 PM
A123      Y           2           01/02/2014 12:50:00 PM

B345      Z           1           01/02/2014 12:50:00 PM
B345      H           2           01/02/2014 12:52:00 PM
B345      K           3           01/02/2014 12:55:00 PM

C678      A           4           01/03/2014 11:00:00 PM
C678      B           8           01/03/2014 11:45:00 PM

***********************

I want to get the Group values (lets call it "finalgroup") for each S.No using its corresponding max.seq value OR/and max.datetime

S.No.      max.seq      *max.datetime                     *finalgroup
A123           2                01/02/2014 12:50:00 PM      Y
B345           3                01/02/2014 12:55:00 PM      K
C678           8                01/03/2014 11:45:00 PM      B

I need my final report to be displayed like this sectioning by S.No

***************************
[Section: S.No]

Sno: |* max Final Group | *max Datetime | max seq

-----

[Section: S.No]

Sno: |* max Final Group | *max Datetime | max seq
***************************
So i created sections based on S.No. Then I have tried creating variables but keep getting #multivalue errors when i display the finalgroup value.

max_seq: =Max([seq]) In Block
finalGroup=[Group] Where ([seq]=[max_seq] In Block)

Tried the same with datetime but no luck.

Any help appreciated on how to extract and display this as stated above.