# RESUME — ISS-2026-9104 (UoM conversion engine) — ✅ COMPLETE

**Status:** All 6 WPs done, reviewed, tested. On `hazemdev2` (both repos). NOT merged to main / NOT shipped — awaiting owner `/fullpush`. Deployed to `/app` (moonui2 dev) for client testing.
**Date completed:** 2026-07-17.

## What shipped
The Units-of-Measure conversion engine: a product with a base unit (e.g. kg) + alternate units (e.g. carton = 12 kg) now converts correctly to the base unit for stock, cost, availability, FIFO/WAC, and pricing — everywhere it matters. **Available by default** (client decision), made safe by the SACRED identity invariant: a single-unit product / base-unit line resolves to factor 1 → byte-for-byte unchanged.

| WP | Capability | Commits |
|----|-----------|---------|
| WP0 | `Core/Services/UnitConversionService::toBase/factorToBase` (pure primitive). | `a0d0992` |
| WP1 | StockService conversion capability (dormant) — 5 methods accept unit_id → toBase; inverse unit_cost on increase; `base_quantity` column on 10 line tables. | `3ae98beba` |
| WP2 | Activation: wired unit_id from Inventory/Sales/Purchases lines; ApproveIssue availability compares in base; FIFO `remaining_value` value-preservation; 8 cancel-seam actions reverse stamped base_quantity. | `b51a12189` (migration `2026_07_16_130000`) |
| WP3 | FE line unit dropdown scoped to the product's own units (ProductUnitScopeService + shared-grid flag, 12 screens) + unlock column. | `a3716a7de` |
| WP4 | Per-unit pricing (product_units price else base×factor) + min-price floor scaled by factor + POS per-unit barcode. | BE `34d073315`+`1281db67e` · FE `e6f2ae173`+`04ebc6fa6` |
| WP5 | Base-unit symbol on balances/movements/reports + `DefaultUnitSeeder` (Count/Weight/Volume/Length, idempotent, registered in updater+installer) + validation (factor gt:0, one-base-per-group atomic demote, group consistency) + ProductUnit destroy. | BE `f171c239f` · FE `c91daf977` |

## Verification
- Reviews: WP0 APPROVE · WP1 [FIN] APPROVE (1 MEDIUM→WP2 FIFO precision, fixed) · WP2 [FIN] APPROVE (1 MEDIUM reverse-leg residual, deferred) · WP4 review 1 HIGH (POS undercharge) FIXED · WP5 APPROVE · **whole-feature cross-WP APPROVE**.
- **Full consolidated batched suite (Inventory/Sales/Purchases/Core/POS): ZERO new failures.** All observed failures are PRE-EXISTING (Core cluster confirmed by reverting Modules/Core to pre-9104 → identical failures; others via per-WP stash + KB baseline). POS 0 fail. New UoM tests all green (WP0 11, WP1 7, WP2 round-trips, WP4 14 POS, WP5 12).
- Migrations `2026_07_16_120000` (base_quantity ×10 tables) + `2026_07_16_130000` (remaining_value) ran on dev. `DefaultUnitSeeder` ran idempotently on dev. FE built + deployed to `/app`.

## Deferrals (surfaced to owner in the ticket)
1. **Production multi-unit reservations** — reserve/release/staging left factor-1; production material CONSUMPTION already converts (issues via wired ApproveIssue). Follow-up WP.
2. **Reverse-leg value residual [FIN]** — return/issue-cancel re-stock via increaseStock recreates a layer at round(base_qty×unit_cost) → residual ≈0.0005×base_quantity per reverse leg (scales with factor; ~0.004 for factor-12/cost-10 carton; accumulates). Forward path value-exact. Fix = value-exact stamp threaded through the 4 reversal paths.
3. **Offline POS barcode** — offline cache doesn't populate matched_unit → offline per-unit-barcode scan adds at base price/unit. Online path fixed.
4. Minor: WP5 zero-base edge + 2 test gaps + StoreProductUnitRequest product-scope (pre-existing); WP0 company-scope note.

## Next
Owner runs `/fullpush` (hazemdev2→main both repos + ship). Portal verification for ISS-2026-9104 published by main session (client tests on moonui2 dev /app).