| A | Special rail car order, schedule increase forecast change |
| B | Engineering change or late release |
| C | Specification (schedule) error/overbuilding |
| D | Shipment tracing delay |
| E | Plant inventory loss |
| F | Building ahead of schedule |
| G | Vendor behind schedule |
| H | Failed to include in last shipment |
| I | Carrier loss claim |
| J | Transportation failure |
| K | Insufficient weight for carload |
| L | Reject or discrepancy (material rejected in prior shipment) |
| M | Transportation delay |
| N | Lack of railcar or railroad equipment |
| P | Releasing error |
| R | Record error or cate reported discrepancy report |
| T | Common or peculiar part schedule increase |
| U | Alternative supplier shipping for responsible supplier |
| V | Direct schedule or locally controlled |
| W | Purchasing waiver approval |
| X | Authorization code to be determined |
| Y | Pilot material |
| ZZZ | Mutually defined |