Get_A method in SAP CRM Web UI

Hi Experts,

I have added field 'A' from AET in BTActivityH, as soon as data filled up in 'A' field same i need to replicate to field 'B'(added from AET) which is available in BTCustomerH.

On web UI when 'A' is filled BTCustomerH is not triggering.It is only triggering when I press ENTER (i.e after any server event).

Hence to fulfill my requiremnt I generated the GET_A method of field 'A' and did the necessary coading.

Even then my requirement is not fullfilled.

Please explain what is the triggering point of GET_A method and its appropriate use?

Best Regards

Preeti Singh