UPC/Inter pack/case pack picking

This picking strategy is applied in warehouses that pick a product in various pack sizes (UPCs). The software understands that each pack size would have a different barcode. The product itself would probably have an EAN barcode or UPC barcode. The same product packed as six units would have a different barcode and if packed as a set of twenty-four it would have a further barcode. The software then directs the picker to the bin where he/she can simply scan the cartons of product and the software will tally up the remaining quantity to be picked. Very often the picker will be picking a case of twenty for, three boxes of six units and two loose units at the same bin location.