Core validation matrix
Field traceability
order_id, shipment_code, and billing rows are joinable
Charge separation
Label, surcharge, and service charges are exportable separately
Reversal chain
Refunds and reversals can be traced back to original shipments
Shared billing definitions
Ops and finance work from one charge definition and export structure
Escalation workflow
Shipment, billing, and technical issues each have an escalation path