Hi Viktor,
please find the below details of component and item view.in this item list i have added 3 AET fields and just implemented drop down end editable on based on return replacement button of item view.for this i have enhanced the EH_ONACTION event handler and i have copied same standard code but added some logic for return replacement functionality.
Component - BT120H_CPL
View - BT120H_CPL/ItemList
Thanks & Regards
Kalpana