A marketplace row shows negative sales or the wrong tax sign - is that a problem?

1. Negative net supply (advisory): a refund-heavy month can genuinely have returns exceeding sales for one marketplace. Verify the figure against the operator's settlement statement - if it matches, file as-is; the portal accepts a negative net.

2. Opposite-sign tax (critical): a row where sales are negative but CGST/SGST is positive (or vice versa) can't be filed - a tax can't point the other way to the supply it's taxing.

3. Open the E-Commerce Operators (Table 14) breakdown and correct the tax figure for that operator - set it to zero or the correct value with the matching sign.

4. Save the edit and Re-run checks - your manual Table 14 edit is applied to validation, so the row passes once corrected.