I have installed openerp in raspberry pi running raspbian OS.The barcode scanner picks the barcode value when i am entering the product details in warehouse module.But then,when i launch the point of sale module,the bar code doesnt seem to pick the value i.e., the item is not placed in the cart if the product is selected via barcode.But the same works if I just click on the products list using a mouse. What could be the problem here?? And i have enabled print_via_proxy  in point of sale configuration. But then no print seems to come after that. I am using epson TM-T82II printer and honeywell mk5145 barcode scanner.

P.S. I am not using the posbox image of raspberry pi but manually installed openerp in PI.