How to Select one value from Context

Hi,

How to select only one value from one context.

this is my source structure.

S_SSG18

|

S_DTM

-

D_2005

D_2006

D_2007

Here S_DTM repeats so many times.. But I need to send data"D" when D_2005 is 159 else "L".

Here my problem is S_DTM repeats 2 times. 1st time it will "L" and 2nd time it is "D". But I need to send only "D" value.

regards,

Ansar.