Resolve GSTR-1 Validation Issues

GSTR-1 issues remain attached to the preparation that found them. There is no permanent ignore action and no in-place rewrite of retained evidence.

Permission required

You need GST Compliance View to read issues and source evidence, Manage to rebuild review and return versions, and Lock to reopen and relock the period. The source correction also requires its invoice, catalog or Settings permission.

Investigate an issue

Open GST → GST Compliance → Returns → GSTR-1, then find GSTR-1 validation issues.

Trace the problem before changing data

1. Read the issue title, explanation and How to fix guidance.
2. Note the document number, issue code and issue number for your review record.
3. Select View ledger to inspect the captured tax evidence.
4. Select Open source when available, or GST settings for registration and turnover issues.
5. Compare the source with the approved invoice, customer and catalog evidence before making a correction.

Common blockers

Issue	What to verify	Supported next step
Missing or invalid customer GSTIN	Whether the invoice is genuinely B2B and the GSTIN checksum/state is correct	Correct a draft, or use the approved historical correction path for an issued invoice
Missing or short HSN/SAC	Item code and minimum digits required by the registration turnover band	Correct the product or service for future lines; correct historical evidence only through a supported transaction workflow
Missing or invalid UQC	Official product unit used on the invoice line	Correct the product and rebuild eligible source evidence
Missing turnover band or turnover value	The visible registration filing profile	A Business Owner updates Settings → Locations & GST
CGST/SGST versus IGST conflict	Registration state and invoice Place of Supply	Correct a draft; do not rewrite an issued invoice outside a supported reversal/correction workflow
Missing nil/exempt/non-GST classification	A 0% line lacks the additional reporting classification	Do not guess. Confirm treatment and contact Support if the current business UI cannot represent it
Document-series gap	Missing, cancelled or inconsistent invoice-number evidence	Verify the series and preserve cancellation evidence; do not create a false invoice to fill a gap
Stale or changed source evidence	Registration values or documents changed after the snapshot	Reopen and rebuild the complete evidence chain

Rebuild after a correction

Create replacement GSTR-1 evidence

1. With Lock access, select Reopen period and record a specific reason.
2. Correct the source through its supported workflow.
3. On Overview, select Sync GST data, then Run validation.
4. Resolve remaining compliance blockers and generate a new snapshot.
5. Select Mark ready and Lock period after approval.
6. In Returns → GSTR-1, select Prepare replacement GSTR-1.
7. Review every applicable section and confirm blockers are zero before package generation.

Warning

Do not change a catalog item and assume an issued invoice changed with it. Do not delete, duplicate or backdate a transaction to silence a validation message.

Important information

If a return was already submitted on the GST Portal, confirm the statutory amendment or correction process with your GST professional before rebuilding Yepsta evidence.

Tip

Resolve the earliest source problem first. A corrected location mapping, GSTIN or place of supply can remove several downstream section and tax-split issues at once.

Related guides

• Prepare and Review GSTR-1
• Export and Upload GSTR-1
• Configure GST for Products and Services
• Troubleshoot GST Setup and Compliance

Last reviewed: 19 July 2026