The new ABAP editor provides the auto complete feature for the ABAP Keywords. How to enable this auto complete feature for non-keywords such as variable names.
To turn on the auto suggestion for Non-keywords in the ABAP editor, just go to ABAP editor (SE38) and open any program in display/change mode. Click on the ABAP editor options button in the right-bottom of the ABAP editor.
Select the checkbox “Suggest Non-Keywords from the Text” under Code Completion.
Now go back to the editor in change mode and start writing some ABAP code.
As soon as you write one or two letters of already declared variable, the system proposes the variable name.