macvicar,
ok. so shipping schedules, 830s if i remember.
product will come in, so you are not manufacturing said product but purchasing it. like i said you will want to find an inventory mgmt software package that is designed for your industry and is based on distribution.
most likely you will be better off with a 3rd party edi solution that can import and export flat files that your inventory system can utilize. the barcode scanning is part of your inventory system, not the edi system.
do a google for some of your suppliers and customers with edi (for example 'walmart edi') you should come up with companies who support, are approved, design software for trading with them.
as for the inventory mgmt software - does your company belong to any trade groups? go to any shows? you will find other distributers in your same field there and can ask them what systems they utilize. you can also start by doing a google say 'distribution inventory management syatems' or refine it and add 'dairy'.
regards,
longhair