How to make Auto Enter Field?

[gullfounder]

Hi,

I am a novice user of Filemaker Pro 11. I am facing a problem. In a layout i wanted to create a field. This field should allow the user to type in bar-code or bar-code device will automatically put it in the field. But the problem is that I want to make the field in such a way that allows auto enter. It means as the user type the bar-code the field should show it the related values. These values are in a another table.

It should not allow the user to enter other values other then that are in the table.

Kindly help on it.

Thanks In Advance.