Drop Down Mashup Thingworx to filter data table value

Hi, i want to make a mash-up using drop down and numeric entry. I have three numeric entry for my 3 columns in my data table. And I also have 1 drop down list for selecting which rows this numeric entries will fill. I am using addorupdatedatatableentries services. The thing is my drop down is not connecting to the numeric entry and my addorupdatedatatableentris services.
I choose on of my area_id in drop down, and input my 3 numeric entries. when when I executed the service using my mashup. My data table is not updating, instead It created a new row using "1" as area_idea.

I attached my dropdown list, numeric entry, and button bindings.

How to make my selected drop down list as updated area_id for my data table?