Die kurze Antwort
Standard Business Central expects every production order line to make one finished item from one bill of materials. A process plant makes several things from one run and has to cost them together. You can work around that with spreadsheets and journals, build it yourself, or add an extension designed for it. Each option has a price, and the cheapest at the start is rarely the cheapest by month twelve.
What standard manufacturing assumes
The model is discrete: a bill of materials goes in, one item comes out, and its cost is the cost of the components, the routing and the overhead. That fits a workshop that builds a pump or a cabinet.
It does not describe a vat. Ingredients may be set in percent of the batch, not as a count of parts. The yield varies. The run produces a main product plus others, and some of what comes out has no value at all.
Three plants that break the model
| Plant | Input | Outputs from one run | What the one-item model cannot hold |
|---|---|---|---|
| Dairy | Raw milk | Cheese, whey, cream, acid water | Whey carries joint cost; cream is credited back; acid water is waste |
| Flour milling | Wheat | Flour grades and milling residues | Several saleable outputs, costed against one grain input |
| Oilseed crushing | Seed | Crude oil and the pressed residue | Cost that follows yield, and a residue with its own market |
In each, the question finance asks is the same: what did each output cost, and how do we know? The one-item model cannot answer it, because it has nowhere to put the second output.
The same shape appears outside these three. Any plant where one input is split, pressed, cracked or separated into saleable parts meets the same wall. Dairy is the clearest example because the outputs differ so much in value, which is why we use it for demonstrations.
What plants do today
Three workarounds are common.
- A spreadsheet that splits the batch cost after the month closes. Fast to start, but it lives outside the ledger, depends on one person, and cannot be audited from Business Central.
- Manual journals for the extra outputs. The stock arrives, but at a cost someone estimated, with no link to the batch that made it.
- One production order per output. Each looks tidy, but the same milk is consumed more than once or is hidden in one order, and the sum no longer matches reality.
All three share one flaw: the second output has no formal place in the order. Lots, cost and genealogy for it are reconstructed by hand.
Four ways to close the gap
| Option | What you do | Where it strains |
|---|---|---|
| Spreadsheet and journals | Keep outputs and cost split outside the ledger | Errors, audit questions, and a key person risk |
| Custom development | Write multi-output orders and costing for your plant | Build, test and maintain it through every Business Central update |
| A separate process-manufacturing system | Run the plant elsewhere, integrate to the ledger | Two databases to reconcile, two sets of master data |
| An extension designed for it | Add multi-output orders, formulas and lots inside Business Central | You adopt its model; check it fits your process |
The fourth option keeps one database and one set of ledgers. Whether it fits depends on how close your process is to what the extension covers, so test it with your own product.
A fair test has three parts. Take one real product with at least two saleable outputs. Run one batch of it from formula to cost sheet. Then ask your cost accountant to find, without help, what each output cost and which lots it came from. If the answer takes a spreadsheet, the gap is still open, whichever option you chose.
More than a second output
Outputs are the visible gap. Behind it sit others: ingredients measured in percent and scaled to a vessel; strength that varies by lot and needs adjusting for potency; lots that blend and rework; costs that arrive as variances; changeovers between allergens. A plant that fixes outputs only will meet these next.
That is why ManufacturingFlow 365 was designed from a gap analysis of 63 process-manufacturing needs in Business Central, grouped into nine modules. The point of the list was to avoid solving one problem and leaving the next.
In Business Central
ManufacturingFlow 365 extends production orders, bills of materials, lots and costing. It does not replace Business Central manufacturing. The relevant modules are:
- Co-products and by-products, with four joint-cost methods.
- Formulas, with percentages, batch scaling and potency adjustment.
- Lots and traceability, with genealogy and a recall workflow.
- Costing, with price, mix, usage and yield variances and a cost sheet for every batch.
- Planning, batch operations, quality, catch weight and shop-floor dispensing.
On the floor, MESFlow 365 reports the actual outputs. See ManufacturingFlow 365 for the module list.
Limits
Designed from 63 identified gaps is not the same as closed. In our own tally, 27 of the 63 are implemented and 36 are partly covered. Exports and some planning pages have not been run. The electronic batch record, e-signature and change approval have not been tested with a second user, so we describe the apps as supporting traceability and audit trails, nothing more. Everything has been run in a sandbox with demo data, on Business Central online, version 29.
See it on your process
Name the product you cannot cost today and we will show where its second output goes. Book the dairy demo scenario and we will run one batch that gives cheese, whey, cream and acid water.
Keep reading: co-product, by-product or waste for the cost definitions, and catch weight in Business Central for another case standard units miss.