Restrict the Keyboard entry and entry through scanner only

Question

Dear Experts,
I have a scenario, A manufacturing company while billing products to the customers will scan the serial nos in the sale order. The serial numbers are wrongly typed during the manual entry.
Hence Business has implemented Bar Code scanning for scanning serial numbers. Still users are manually entering serial numbers,
To bring tight control in the process ... Business is asking to restrict the manual input and allow only Bar code scanning for serial number entry.
I have tried the below to implement the same:
The serial number field is made to display mode by making screen - input = 0.
Now the text field is brought to display mode. But unable to scan the data in that field .
Pl help if you have any idea on this.
Thanks in advance.
Vidhya

Answer 1

Answer from Michael Evershed here: Re: Restrict keyboard entry allow only scanning
> If your barcode scanner is the type that plugs into the keyboard port of the computer SAP can't distinguish between the barcode scanner and data entered by the keyboard.
You have to ask your scanner manufacturer if there is a solution (for example, like using an encoder at scanner level, that will be decoded by the abap program)