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Every BOM revision walks every open PO and WO it touched. Every time.

Engineering posts a revision Friday afternoon. The buyer sees it Wednesday. By then two open POs are already in transit at the old revision. That five-day gap is where most discrete-shop scrap comes from. Polymr watches the PDM feed, builds the diff the moment a revision releases, walks every open PO and WO that touched the changed parts, and drafts the cancel, amend, or new actions before the buyer sits down for the next standup.

Six rows. Three changes. The diff is the record.

The view below is the row-by-row comparison between v5 and v6 of PMR-4031. Two lines added, one removed, one spec changed. Each changed row carries a marker in the left gutter, the v5 and v6 values side by side, and a background tint that shows the kind of change. There is no separate design view and approved view; the diff is the screen everyone works from.

app.polymr.tech/inventory/bom/PMR-4031/diff

BOM.PMR-4031 · rev v5 → v6 diff

CN-1187 · posted 2026-05-29 16:42 · linked drawings PMR-4031-A..D

Polymr ERP
+2 added-1 removed~1 spec change
ComponentQty v5Qty v6Spec v5Spec v6
.Hub forging11A36 zincA36 zinc
.Bearing race2238 mm38 mm
-Bushing1std
~Seal ring11EPDM 38mmFKM 38mm
+Lock washer4split 8mm
+Bolt M8x244A325

Audit: rev v6 posted to PDM event 2026-05-29 16:42, CN-1187 references PMR-4031 + linked drawings PMR-4031-A through D.

One diff. Three kinds of open record. One bundle to approve.

Polymr walks the diff against every open record and produces the impact bundle. Open POs on the left, open WOs in the middle, open customer SOs on the right. The buyer reviews once, approves once; the individual actions go out from there.

app.polymr.tech/review/revisions/CN-1187/impact

CN-1187 · impact walk

5 POs · 3 WOs · 2 SOs · buyer bundle ready

Polymr ERP
Open POs (5)
  • PO-84179-$4,180
    Cancel race line
  • PO-84212+$1,240
    Amend qty
  • PO-84231+$840
    Create · bolts
  • PO-84198TBD
    Hold pending QC
  • PO-841560
    No change
Open WOs (3)
  • WO-1124
    Replan W22
    consume v5 on hand
  • WO-1126
    Replan W23
    new BOM
  • WO-1131
    Hold
    line-lead review
Customer SOs (2)
  • SO-22418
    Notify rev change
    drawing rev v6 attached
  • SO-22441
    Signature ask
    spec EPDM to FKM
Bundle dollar delta -$2,100 net
Review eachApprove bundle

Audit: impact walk against open PO + WO + SO ledger as of 2026-05-29 16:43; CN-1187 referenced on every action.

The approval chain is the chain of custody.

Every change notice moves through a chain you configure. Engineer, buyer, line lead, ops VP. Each sign-off captures the diff exactly as it looked at the moment of signing and writes it to the audit log. The chain itself can be edited per category; nothing flows downstream while a step is still pending.

app.polymr.tech/review/revisions/CN-1187/approvals

CN-1187 · approvals

Chain of custody · 2 of 4 · in flight

Polymr ERP
  1. 1
    Engineer · M. Chen
    Approved16:42
  2. 2
    Buyer · A. Park
    Approved17:14
  3. 3
    Line lead · J. Reyes
    Pending
  4. 4
    Ops VP · S. Mehta
    Queued

Audit: each step persists to ledger with signing key, timestamp, and the diff state visible at sign time.

A shop where two of every ten revisions missed an open PO.

Anonymised engagement with a discrete contract manufacturer. Revisions missing open POs was the single biggest source of scrap. The impact walk pulled it to near zero in the first quarter of running.

Anonymized engagement
Operations director, contract manufacturer of mechanical sub-assemblies
Situation
Drawings landed from three customer engineering teams across the week. Each revision triggered a full BOM re-type into the ERP, an RFQ packet build, and a sweep of open POs for downstream impact.
What was breaking
Of every ten revisions, two missed an affected open PO. Those misses surfaced 3–5 weeks later as the wrong rev shipped to a customer, a scrap event on the floor, or a vendor invoice that no longer matched the PO.
  • BOM extraction + RFQ
  • Engineering revisions
  • Quote-to-procure
Outcome · 6 weeks
100%
Revision-to-PO coverage
was 78%+22 pts
Illustrative, reflects this specific deployment. Outcomes vary by plant, stack, and scope.

Where revisions hand off to the rest of Polymr.

The reader that pulled in the v6 drawing feeds this loop, and the replan that drops out of an approved revision lands in the planning queue. Industry context sets the cost of a missed revision.

Quote, engineering, RFQ

The parse that ingested the rev-v6 drawing in the first place. The quote-to-RFQ workflow is the upstream feeder for this loop.

Open

Demand, plan, inventory

The replan that drops out of an approved revision lands in the planning workbench. The two workflows share the same operator gate.

Open

Discrete manufacturing

The industry view: BOM-driven shops where the rev-to-PO loop governs scrap, rework, and customer satisfaction.

Open