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fix(invoice): preserve supported XML fields across round trips - #51

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mqqz merged 16 commits into
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fix/invoice-semantic-roundtrip
Oct 19, 2026
Merged

mqqz merged 16 commits into
mainfrom
fix/invoice-semantic-roundtrip

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@mqqz

@mqqz mqqz commented Oct 18, 2026 •

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Description

Importing existing invoices silently dropped buyer information, VAT exemption reasons and delivery dates. Preserve these fields through the typed model and XML round trips, with builder APIs and binding support.

The audit also fixes lost line IDs and individual allowances/charges. Prepayment references retain their metadata and tax subtotals. Accounting tax currency amounts survive import, as do payment instructions and optional note language attributes. Malformed supported fields now produce parse errors instead of disappearing.

VAT group balances are checked after all adjustments. A 20.25 line with a 25 allowance followed by a 30 charge now succeeds, just as the reverse adjustment order does. Regressions also verify that a final negative balance still fails.

Signed imports retain their original XML. Raw XML hashing and signing remain unchanged. The coverage matrix documents supported fields, normalization and unsupported structures; arbitrary UBL extensions and attributes are not preserved.

Validation

  • Fresh instrumented workspace tests passed. Local patch coverage is 100% (1,458/1,458 changed executable lines), including all 374 new FFI lines. Workspace Clippy passed with warnings denied.
  • Golden fixtures pass semantic round trips and regenerated XSD checks. Fixtures passing the original CEN/KSA error checks also pass after regeneration.
  • All 63 Python tests passed, along with C/C++ binding contracts and generated-binding reproducibility checks.
  • Formatting, diff checks and strict documentation builds passed.

C#, Kotlin and JS runtime suites, non-Linux builds, and live ZATCA acceptance were not run.

Checklist

  • Bug fix with regression tests
  • Builder APIs and affected bindings updated
  • Field coverage and preservation limits documented
  • Self-review completed

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📝 Code Review ✅ Completed 2026-10-19T11:51:48.994371Z ec2d3c0 New commits
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Codecov Report

✅ All modified and coverable lines are covered by tests.

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Comment thread fatoora-core/src/invoice/xml/parse.rs

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Comment thread fatoora-core/src/invoice/builder.rs

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Comment thread fatoora-core/src/invoice/xml/parse.rs Outdated

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Comment thread fatoora-core/src/invoice.rs
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let finalized = parse_finalized_invoice_doc(&doc)?;
let signing = parse_signed_properties(&doc)?;
let signed = finalized
.sign_with_bundle(signing, xml.to_string())

P2 Badge Preserve the QR payload read from signed XML

When the embedded QR has missing or differing tags 1–5, the signed parser still accepts it because parse_signed_properties only requires tags 6–8, but this call discards the source QR and sign_with_bundle synthesizes a new payload from the invoice model. Consequently, SignedInvoice::qr_code() can return data that was never present in SignedInvoice::xml(), unlike signed invoices created locally; either retain the extracted QR string or reject inconsistencies before constructing the object.

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Comment thread fatoora-core/src/invoice/xml/parse.rs Outdated

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Comment thread fatoora-core/src/invoice/xml.rs Outdated
Comment thread fatoora-ffi/src/invoice.rs
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Comment thread fatoora-core/src/invoice/builder.rs Outdated
@mqqz
mqqz merged commit 4149e9b into main Oct 19, 2026
42 of 43 checks passed
@mqqz
mqqz deleted the fix/invoice-semantic-roundtrip branch October 19, 2026 20:14
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