HOW TO: prevent Item description from showing up in the child table "entry lookup"

Hi guys,

I do not want the item description to appear in the pop-up lookup when we click on “item code”
This actually happens when I first add new item without adding any description, because it seems the programming force the description = item code

However, when I make any changes to the description and change it back to be same as “item code”, the description now appears in the pop-up lookup

When I data export “item”, it seems system added < d iv> < /di v> to the description which I edited.
Is there a way to easily remove this < d iv> < /di v> without having to export, edit the excel and then import the data back?

many thanks