How do suppliers avoid EDI chargebacks?

Most chargebacks and rejections trace to five causes: the ship notice that arrives after the truck, the ship notice that does not match the pallet, item numbers that do not match the partner's item file, invoices that disagree with the purchase order, and acknowledgments that never came back while nobody noticed.

One structural rule prevents the majority: build every outbound document from the record of what actually happened, never from what was planned and never by hand. Generate the ship notice from confirmed shipment lines when the label prints. Generate the invoice from the PO and the ship notice. Reconcile your item file with each partner's before go-live, and put a monitor on the acknowledgment chain that alerts a human when anything is late.

If you already ate a chargeback and want to know whether to dispute it, the answer is in the timestamps: if your file was accepted before the truck arrived and the quantities match, dispute it. If not, fix the process, because next week it happens again.