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Format-only check against the standard 15-character GSTIN pattern, no
checksum validation -- a deliberate, documented limitation. Fires on
C023 ('INVALIDGSTIN') in dataset A. Doesn't feed outstanding/overdue
math, so nothing downstream is excluded; flags master-data quality
only.
Refs: docs/RULES.md
Same master-data-quality rationale as E006, kept as a separate code because "missing" and "malformed" call for different remediation. Fires on C025 in dataset A. Refs: docs/RULES.md
withrvr
merged commit Aug 31, 2026
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claude/erp-collection-reporting-workflow-iycqto
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Phase 2 (feature 3 of 6): Customer-quality rules
What this adds
E006 (invalid GSTIN format, regex-verified against all 25 customers in
dataset A) and E008 (missing GSTIN) — the two rules with zero
calculation-layer interaction, kept as separate codes since "missing" and
"malformed" call for different remediation.
Assessment requirement served
The workbook's "invalid/missing GSTINs" exception category.
Docs updated
Verification
Known gaps carried to next phase
coverage + reconciliation tests (PR6).
Generated by Claude Code