Hi,
Rename NumericField11 to NumericField3.
In the hierarchy view you will see the two objects, NumericField3[0] and NumericField3[1]. Now select one of these, doesn't matter which one, and go to the Object > Binding tab.
Set the binding to 'global'.
This way what ever is typed into either field will automatically appear in the other one - no script involved.
Niall