sort and filter

Hi Group,

I am working on Message mapping where I need to select the record which having lowest price based on material , for example

if I have 5 records with material and price , I need to select one record with lowest price.

Material         Price

--------         ------

900               10.00

901                5.00

902                3.00

903               15.00

904                4.00

output should be

902               3.00

Can any body suggest how I can achieve this in graphical mapping.