Diagnoses why multi-note delivery slips lose data and specifies phases 1-3
of the fix.
Root cause: the n8n workflow's "Match items to PO" Code node runs in
runOnceForAllItems mode and returns a single item, so the workflow makes
exactly two callbacks regardless of how many notes a document holds. A
4-note scan produced 2 promoted notes and 2 empty records in an invisible
status, while reporting auto-verified at 95% confidence.
Also found: delivery notes are weighbridge tickets in kg while PO lines are
priced per ton, and nothing converts. po-fulfilment and delivery-note-value
therefore overstate received quantity 1000x across all 57 existing rows.
Phase 1 fixes the unit model and migrates existing data. Phase 2 moves
ingestion into a staged inbox with a deterministic validation gate, so
nothing reaches delivery_notes unless every page is accounted for. Phase 3
renders that state machine as a Kanban board.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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