Selecting the only option left for item field when tab is pressed in Sales order Item

Hi All,

When i try to select “item code” in Sales Order Item table ,if i write some letter, erpnext will filter and display the matching records.So i have to manually select, then only it will select and display in the “item” field.

But i want without selecting manually,if i enter tab then matching record should automatically store in the “item”.

I am not getting how to achieve this.Please help me.

Thanks in advance,