LORD: ERP Quotation passing custom fields to ERP system

Hi Gurus

I extended the ERP quotation screen with custom fields which are same like ERP fields using AET and generated the setter and getter and methods for those fields in CRM system , but after entering the values into the custom fields and pressing enter the values are not getting retained , I mean after pressing enter it will communicate with ERP system using RFC call and return back to the CRM systme after that the custom fields are becoming empty, how can I track those values after coming back to the crm system .

Thanks & Regards

Madhu