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That distinction prevents the most serious reuse errors: moving goods under a bill with the wrong destination, invoice, value or product details; assuming a replacement vehicle creates a fresh validity period; or using a Part A slip as if it were a completed bill.
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The decision to make before changing anything
Identify what changed, then check the bill’s status. The correct action depends on whether the error is in Part A or Part B, whether the bill is active or expired, and whether the shipment itself changed or only the conveyance changed.
| Situation | Correct route | What not to do |
|---|---|---|
| Wrong invoice, supplier, recipient, destination, product, quantity, value or tax information | Check cancellation eligibility; cancel within the permitted period and generate a corrected e-way bill. | Do not overwrite Part A or continue moving goods under materially wrong details. |
| Vehicle, transporter document or transport mode changes while the bill is active | Update Part B for the actual conveyance or transport document. | Do not assume the update restarts validity. |
| Vehicle breaks down | Enter the replacement vehicle in Part B, if the original bill is still within its validity. | Do not create a new validity period merely because the vehicle changed. |
| Bill is close to expiry or has just expired because of an exceptional event | Use the applicable extension process with the required reason, location, remaining distance and transport details. | Do not move goods on an expired bill without a valid extension. |
| Recipient refuses delivery and goods return | Arrange the sales-return documentation and a new e-way bill for the return movement. | Do not repurpose the outward bill as though the goods were still going to the original destination. |
The official E-Way Bill System FAQ and GSTN API guidance were accessed on 13 October 2026. Portal validations and GST notifications can change, so confirm the live portal treatment for unusual cases.
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Part A and Part B: the distinction that controls every correction
What Part A contains
Part A records the underlying transaction and goods: the invoice or document details, supplier and recipient, place of dispatch and delivery, product description, quantity, value and related tax information. These facts describe what is being moved and between whom.
What Part B contains
Part B records how the goods are moving: the vehicle number for road transport or the relevant transport-document number for rail, air or ship, along with the transport mode. It must match the conveyance actually carrying the consignment.
The official FAQ states: “The e-way bill once generated cannot be edited or modified. Only Part-B can be updated.” In practical terms, a generated bill is not a reusable template for a new transaction. Part B is a controlled transport update, not a way to repair a Part A mistake.
Prevent errors before pressing “Generate”
A two-minute document check is safer than trying to repair a generated bill. Use the source invoice or delivery challan as the authority and compare every field that will appear on the bill.
- Check the parties. Confirm the supplier’s and recipient’s GSTIN, legal names and dispatch and delivery addresses. Make sure the “Bill To” and “Ship To” arrangement is reflected correctly where they differ.
- Check the commercial document. Verify document type, invoice or challan number and date. Watch for transposed digits and duplicate document numbers.
- Check goods data. Match the HSN or product details, quantity, taxable value, tax rates and total value to the source document. Use the correct unit of measure.
- Check the journey. Confirm the actual place of dispatch, destination, estimated distance and whether the movement is a sale, stock transfer, job work, return or another permitted purpose.
- Check transport data. Enter the correct mode and the registration number or transport-document number. Ask the carrier to confirm the vehicle before submission when possible.
- Review the final summary. Save or print the generated number and compare the displayed details with the source documents before the vehicle leaves.
When entering products makes another field difficult to change
The portal FAQ notes that some fields may become harder to edit after commodity details are entered because a change can alter the applicable tax rate. If a needed field is locked or validation fails, delete the entered product details first, correct the affected field, and then re-enter the products. This is a pre-generation correction. It does not make Part A editable after the bill has been generated.
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If the generated bill has a Part A error
Use the cancellation-and-regeneration path
Do not try to “reuse” the bill by treating its incorrect transaction data as a minor typo. Check whether cancellation is legally and technically available, cancel the incorrect bill, and generate a fresh bill from corrected source documents.
- Open the e-way bill record and confirm that the error is in Part A rather than only in transport details.
- Check the 24-hour cancellation window and whether the goods were transported according to the bill.
- Cancel the bill if it is eligible. The FAQ describes cancellation where the goods were not transported or were not transported according to the bill.
- Record the cancellation reference for the invoice file and tell the transporter not to rely on the cancelled number.
- Correct the invoice, delivery challan or other source record if required by the underlying transaction.
- Generate a new e-way bill with the corrected Part A and current Part B information before movement.
A bill that has already been verified in transit cannot be cancelled under the FAQ. If the 24-hour period has passed, or verification blocks cancellation, stop treating the old bill as a document that can be rewritten. Obtain guidance from the applicable GST authority or qualified tax professional on the specific facts, and preserve the original bill, verification details and supporting documents.
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The e-way bill identifies a particular movement. A changed recipient, destination, invoice or goods description can change the legal and logistical identity of that movement. Updating only the vehicle number would leave the underlying transaction wrong, while generating a second bill without dealing with the first can create duplicate or conflicting records. The cancellation status and the replacement bill should therefore be kept together in the shipment file.
If only transport details change: update Part B
Vehicle or transport-document changes
When the transaction remains the same but the conveyance changes, use the Part B update workflow. Enter the vehicle registration number for the vehicle actually carrying the goods, or the new transport-document number for rail, air or ship movement. The GSTN API documentation describes Part B updates while the bill is active and within validity.
The FAQ permits repeated Part B updates during the bill’s validity. Each entry should reflect the next real movement leg, not a planned vehicle that has not taken possession of the consignment.
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Vehicle breakdown
A replacement vehicle after a breakdown can continue under the same e-way bill only within the original validity period. Update Part B with the replacement vehicle and retain evidence of the breakdown and transfer where practical. The vehicle change does not create a new validity clock.
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At each movement leg covered by the portal process, update Part B so the record matches the actual vehicle or transport document. Stale transport data is especially risky after a trans-shipment: a bill showing the first truck is not a reliable record once the goods have moved to another conveyance.
Another transporter takes over
The e-way bill can be assigned onward. Under the FAQ’s description, the latest assigned transporter may update Part B in the circumstances allowed by the portal. Confirm that the assignment has been completed and that the new transporter has the required portal permissions before relying on an update. Keep a handover record showing when custody changed.
Validity starts with the first Part B entry
The official FAQ says: “The validity of the e-way bill starts when first entry is made in Part-B i.e. vehicle entry is made first time in case of road transportation or first transport document number entry in case of rail/air/ship transportation, whichever is the first entry.” A later vehicle-number update does not recalculate the start time.
Ordinary movement
Under the retrieved CBIC text for CGST Rules, Rule 138, ordinary movement receives one day for up to 100 km and one additional day for each further 100 km or part thereof.
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Over Dimensional Cargo
The official FAQ describes a different allowance for Over Dimensional Cargo: one day for each 20 km or part thereof. Apply the category only when the consignment meets the applicable definition and portal treatment.
| Movement category | Distance rule stated by the official materials | Operational consequence |
|---|---|---|
| Ordinary movement | One day for up to 100 km, plus one day for each further 100 km or part thereof. | Calculate from the first Part B entry; later vehicle changes do not restart the count. |
| Over Dimensional Cargo | One day for each 20 km or part thereof. | Use the category only where the consignment qualifies and the portal accepts it. |
The short-distance exception needs a date-and-movement check
The available materials are not consolidated into one date-stamped rule history. The retrieved CBIC rule text shows a less-than-10-kilometre exception for specified movements, while GST Council materials describe an amendment increasing the relevant distance from 10 km to 50 km, and the FAQ describes a 50-kilometre exception. Do not tell staff that every movement under 50 km is automatically exempt. Identify the specific leg and movement type, check the current portal validation and applicable rule or notification, and document the basis for relying on an exception.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Extending an e-way bill near or after expiry
Extension is an exception process, not a routine way to gain more travel time. The FAQ identifies circumstances such as a natural calamity, law-and-order problem, trans-shipment delay or vehicle accident. The transporter carrying the consignment at the time of expiry is identified as the party who may extend it.
Information required for the API extension workflow
GSTN API documentation specifies an extension window from eight hours before expiry to eight hours after expiry. It requires:
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- the reason and a description of the exceptional event;
- the present location of the goods;
- the remaining distance; and
- the relevant transport mode and vehicle number or transport-document details.
The API specification also lists a restriction on extending beyond 360 days from bill generation. Treat these as API validations and confirm the live portal behavior for the transaction and the current notification.
Practical extension steps
- Check the exact expiry time and the bill’s current status.
- Confirm that the goods are still with the transporter who is entitled to request the extension.
- Document the exceptional event and the goods’ present location.
- Measure the remaining distance realistically, rather than copying the original estimate.
- Enter the current vehicle or transport-document details.
- Submit within the permitted window and save the extension acknowledgement.
If the bill has already expired and no applicable extension is available, do not continue movement on the expired number. Seek transaction-specific GST advice and follow the portal’s current instructions before resuming.
Returns, refusals and rejected deliveries
A recipient’s response to bill details is not the same event as physically sending goods back. If goods are refused, coordinate the return with the supplier or recipient and create the documentation for a sales return or other applicable return reason.
- Confirm why the delivery was rejected and who is taking responsibility for the return movement.
- Prepare the relevant return invoice, credit note, delivery challan or other document required for the transaction.
- Generate another e-way bill for the return journey, showing the sales-return purpose and the correct supplier, recipient, origin and destination for that movement.
- Enter the vehicle details for the return conveyance in Part B.
- Link the return documents to the original outward shipment in your records, without presenting the outward bill as if its original journey were continuing.
Common portal errors and their fixes
“Invalid Format” for vehicle number
Use the registration format required by the portal, including the state identifier and the required number of digits. The FAQ provides accepted patterns and examples. Remove spaces, punctuation or missing zero padding that does not match the registered format, then re-enter the number exactly as shown on the vehicle documents.
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Part A slip mistaken for a complete bill
A Part A slip is temporary. The FAQ says the e-way bill is generated after the required Part B transport details are entered. Do not hand the slip to a driver as though it were the completed movement document; confirm that the final e-way bill number and Part B are available.
Wrong field assumed to be editable
Once generated, Part A is not corrected through ordinary editing. Stop trying to overwrite it and move to the cancellation-and-regeneration decision described above.
Stale data after a vehicle or mode change
Update Part B before the next movement leg. Compare the portal record with the vehicle or transport document at handover so that the number shown to enforcement personnel matches the conveyance on the road.
Expired bill still being used
Check the calculated validity from the first Part B entry. If an exceptional event qualifies, use the extension workflow in its permitted window. Otherwise, do not move goods under the expired bill while assuming that a later vehicle entry cures the expiry.
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Quick Recap
A control checklist for dispatch teams
- Keep the invoice or delivery challan open while entering Part A.
- Have a second person verify GSTINs, document number, destination, HSN, quantity, value and tax details.
- Obtain the actual vehicle or transport-document number before final generation whenever possible.
- Record the exact time of the first Part B entry; it starts validity.
- At every handover, compare the conveyance with Part B and update it before movement continues.
- Monitor the expiry time rather than relying on the date alone.
- Keep cancellation, replacement-bill, assignment, breakdown and extension evidence with the shipment file.
- For a return, create a distinct return movement record instead of modifying the outward bill.
- Check current portal validation and notifications for short-distance exceptions and other edge cases.
What the rules do not allow you to assume
- A generated bill is not a general-purpose editable record.
- A Part B update does not repair an incorrect invoice, destination or goods description.
- A replacement vehicle does not restart validity.
- An assignment to another transporter does not remove the need to keep Part B accurate.
- A Part A slip is not proof that the completed e-way bill exists.
- A return or rejected delivery is not simply a continuation of the outward journey.
- A short distance is not automatically exempt without checking the exact movement, current portal validation and applicable rule.
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