How to send data form standard BO to EC

Dear Experts,

Is it possible to send data to Ec from standard BO ?

I created custom object and i added by EC to standard floorplan. It's work perfectly, but i need access to parameter from the standard screen. I can't bind by this parameter because it not exist in standards outports. I thought about using internal communication or internal web service, but Web service won't work until i save and back again to this object and internal communication dosen't have this parameter so i can't use this solution.

Can somebody help my to resolve this problem ?