Issue with drop down datawindow

Hello All,

I have drop down datawindow, Having the values

Data Value           Display value

A                              Test1

B                               Test2

C                              Test1

When I select the Display value Test1 and Data value C and after selecting the display value  when i tab out of the column(DDW) where i have selected the Display value ,it automatically select the Data Value A and Display Value Test1 , however i have selected the Data Value C and i checked the code of itemchanged and there is nothing written there in this event. So can any one help me out here with this issue. How i can fix this issue.

I am using PB11.5.

Thank you for your help in advance!!!!

Regards,

Prahallad