Leading Zero Problem in product barcode

Dear Gurus,

we are migrating from a system which allows leading zeros in bar-code numbering and we import the same into sap IS-Retail we are having a problem, as sap does not recognize leading zeros and truncates the same.

the problem we are facing is the bar-code in the legacy and sap is different. we would like to have sap also recognize leading zeros.

is there any customization setting to enable this........

Thanks,

rakesh.........