Web GUI overwrite / insert mode - how can I change it?

Hello experts,

I created a report where the user scans a barcode. The scanned value will be processed. it works fine.

Later, the report will be used with sap web gui.

The problem is, the webgui works with insert mode, I need overwrite mode. Otherwise the next scanned barcode will lead to an invalid value.

I tried to change from insert to overwrite (keyboard) > doesn't work.

Is there a way to set a parameter in the report?

Thanks for any help.