Ran the pipeline over 34 real documents: 7 processed, 14 blocked, 13 never
picked up. 13 of the 14 blocks were our own bugs.
Root causes, measured from dn_batches.checks:
- 5 batches are tax invoices or collection notes, which carry no delivery
note number. The pipeline was built assuming every document has one.
- 4 blocked on product_matched; the matcher requires the PO line's first
token to be 3+ chars, so "IJ Pipes 450x2.5 100D" never matches
"IJ PIPES-450 X 2.5(100D)".
- 2 on weighbridge_arithmetic comparing nett in kg against quantity in tons.
- 2 on a single stray page condemning notes that promoted correctly.
Critically, two candidate relaxations of the matcher were tested against the
real descriptions and BOTH produced wrong matches (U PIPES-600 to S&S
Pipes-1050; Kabelflex to uPVC Pipe). A wrong match applies the wrong rate to
money, so the fix is a three-outcome matcher -- matched / ambiguous / none --
with a dimension gate, plus a learned alias table for wording that can never
match textually. The specified algorithm was verified against all 23 failing
descriptions with zero wrong matches.
Also found: dn_batches.created is never populated, so board ordering is
arbitrary; and the tick has never claimed a batch, so the n8n schedule is
not running.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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