Work Order Backflush & Consumption Posting: Relieve Component Stock When a Job Closes

The problem this kills

A job finishes on the floor. The parts are gone — consumed into finished goods and scrap — but your inventory system still says those components are sitting on the shelf. So your on-hand counts are wrong, and they stay wrong for days or weeks until someone manually issues every component against the work order, line by line, from memory and a paper traveler. Meanwhile planning re-orders parts you don't have, or skips parts you do, because the numbers lie.

Backflushing is the fix every ERP claims to do and almost nobody trusts: when a work order completes, relieve component stock automatically based on the bill of materials and the quantity you built. The reason teams don't trust it is that the standard math and reality diverge — operators report extra scrap, an over-issue happened, a substitute part went in — and a blind auto-post buries those problems in your inventory. So people fall back to slow manual issuing, and the counts drift anyway.

This tool gives you the speed of backflushing with the safety of a human gate. It does the standard math instantly — usage per unit times the quantity you completed, plus the scrap that was actually reported — and then it shows you the variance against standard so the controller can see what doesn't add up before a single component is relieved. The AI drafts; a person approves; only then does the stock relief get exported. Your counts get corrected the day a job closes, not the week after.

What you'll build

A simple internal web app for your planning and inventory team. You import your BOM / standard usage (which components go into a parent, and how much of each per finished unit), your work-order completions (WO number, the SKU it built, completed quantity, and reported scrap), and optionally your current component stock for on-hand context.

You pick a completed work order. The tool computes the standard consumption for that job — for every component on the BOM, usage per unit × the completed quantity — adds the reported scrap, and lays the result next to standard so any variance (an over-issue, a yield loss, a substitute) is highlighted, not hidden. The controller reviews the drafted consumption, fixes what looks wrong, and approves. Only then does the tool export an inventory-relief CSV — negative stock adjustments in the exact columns your ERP expects. A hard duplicate guard means a single WO can only be backflushed once, unless someone explicitly reopens it, so you can never relieve the same job's stock twice.

What's inside the Implementation Plan

The downloadable plan is a step-by-step file you paste into an AI coding agent. It opens by interviewing you about your business — how your work orders and BOMs are exported and their exact column names, how you identify a WO and a SKU, how standard usage is expressed (per finished unit, per batch, per 100), how completed and scrap quantities are reported, whether scrap consumes extra components or not, your typical and peak job volumes, who must approve a relief and what they check, and the messy exceptions (over-issues, partial completions, substitute components, by-products, a WO that gets reopened). It reflects a short tailored spec back to you and gets your thumbs-up before it builds anything — so the consumption math matches how your shop actually closes jobs, not a generic template.

From there it walks the agent through the data model, the BOM and completion import with duplicate guards, the standard-consumption engine, the scrap and variance layer, the controller's review-and-approve gate, and the inventory-relief CSV export. Every step ends with a ready-to-copy prompt. There's a full "No API yet?" path that uses Google Sheet / CSV imports as the data source and produces a clean stock-adjustment CSV in your ERP's exact columns — so you can build and run the whole thing this weekend regardless of which ERP you run.

The governance it includes (this is the point)

Relieving inventory is a write to your system of record, so the controls aren't optional. The plan builds in login so only your team can use the tool, row-level security so you only ever see your own organization's work orders and BOMs, a complete audit trail of who computed which consumption and who approved which relief, a hard human-approval gate so no stock adjustment is exported until the controller signs off on the drafted consumption and its variance, and duplicate guards keyed on the WO number so the same job can never be backflushed twice unless it's explicitly reopened.

Who it's for

Planners, inventory controllers, and shop supervisors who close jobs and own the accuracy of component stock. If you can explain what goes into your products and how a finished job gets reported, you can build this — and you'll stop watching your component counts go wrong every time a work order closes.

You've got this — start with the plan, paste the first prompt, and answer the interview. You'll have a completed job's drafted consumption and variance on screen before the weekend's out.