A correction fixes work that was wrong or incomplete against the evidence and instructions available at the agreed production cut-off. A supplement addresses a defined change, such as newly available evidence or newly identified damage; the contract should distinguish these events.
Use a proposed four-way classification:
- Producer defect: supplied evidence was misread, omitted or incorrectly entered.
- Inspection defect: required information was absent or defective at intake.
- New information: relevant facts became available after the cut-off.
- Scope or instruction change: the carrier changed the requested deliverable or applicable instruction.
Require timestamps and source references before assigning a category. If a producer was expected to flag missing information but proceeded without doing so, record that as a separate intake-control failure even where the original information gap arose in the field.
Do not call every later payment a production failure. Equally, do not allow all correction work to be reclassified as chargeable supplements. Keep an adjudication route for mixed causes and technical disagreements, and specify who pays while a dispute is resolved.