Key points
- Reject I, O and Q before a VIN enters a production list.
- Lock the correct VDS and VIS structure in a reusable profile.
- Calculate position 9 instead of entering it manually.
- Check duplicates before committing a serial range.
1. Treating a VIN as a free-form 17-character field
A single text field hides where WMI ends, where VDS begins and which VIS positions must be numeric.
Use position-aware input and visibly separate the four functional parts so structural errors appear before submission.
2. Allowing I, O or Q
These letters are prohibited because they can be confused with numerals. Reject them during typing and paste operations rather than relying on a later visual review.
3. Using letters in the final four VIS positions
VIN positions 14–17 must be digits. This rule should be enforced by both the interface and the server-side validation used for saved records.
4. Entering position 9 manually
A given set of 16 VIN characters has only one correct check digit. Keeping position 9 read-only prevents discrepancies between a spreadsheet, an operator and the VIN marked on the vehicle.
5. Reusing or overlapping serial ranges
Separate spreadsheets or uncoordinated teams can generate the same serial range twice. Check the central VIN register in the same transaction that creates the series.
6. Changing an approved structure mid-batch
A one-character VDS or VIS change can create a different vehicle definition. Archive old profiles and create a new controlled profile rather than editing historical VINs.
7. Deleting the evidence
Removing a void or mistaken sequence without an audit explanation creates ambiguity. Preserve status and traceability information according to the manufacturer’s controlled retention process.
ManageVIN is a calculation and record-management aid. It does not assign WMI codes and does not replace an approval authority or professional compliance review.
