Disable Barcode input in RFUI screen field

Hi Experts,

We have an RF screen developed to enter remaining quantity in any storage bin during ZERO STOCK CHECK. Some times user instead of entering quantity manually he scans the Warehouse task barcode in that field. because of this Invalid values are being stored as available stock in bin.

Is there any way to disable Scanning of bar code into a particular field in RFUI screen?

Thanks,

Aswath.