How to send specifics values from a grid advanced to a service or widget?

Hello

Recently I started to use this platform, what I'm trynna do is send a value from a grid advanced to a service or widget, here's how my bindings look like: 

The end-user must type an ID which I use as an input for a service (datosprueba), once the end-user presses the enter key it triggers the service and it shows him a table with the required data, that table is editable, like this:

It is expected that the end-user fill in the "cumple" column, like this 

This is the part which I'm struggling with, I wanna make use of that "Yes" or "No" value, so I can use it as an input in a service and store it in a database, how can I do that? I'm trynna use the edited table property, but I havent figured out yet how to properly use it, hope I made myself clear, please if any of you can help me.

Oh, and btw I already did this: 

it just doesnt work, the textfield stays blank. Thanks in advance.