Manufacturing in Business Central: BOMs, routings and real product cost

Three objects everything else hangs on

Manufacturing in Business Central rests on three pieces of master data. Get these right and production orders mostly configure themselves; get them wrong and every order needs manual repair.

The item card ties them together. On the Replenishment tab you set Replenishment System to Prod. Order and point at the BOM and routing numbers. Without that, planning will keep suggesting purchase orders for something you manufacture.

Capacity hierarchy: groups, work centres, machine centres

Production capacity is arranged as a strict hierarchy, and the rules are worth memorising because they cannot be bent later.

• Work centre group sits at the top.
• Work centres belong to a group — each to exactly one.
• Machine centres belong to a work centre — again, each to exactly one.

Machine centres represent operators and machines: the level at which real capacity lives. Work centres aggregate them, which is what makes planning by department possible without describing every machine.

Capacity itself comes from calendars. A work centre calendar defines working days and hours, shifts, holidays and absence, and produces gross available capacity — normally expressed in minutes. Efficiency and capacity values on the centre then determine how much of that gross figure the scheduler can actually load.

Practical consequence: if scheduling produces impossible dates, the fault is almost never the routing. It is a calendar that says the shop floor works hours it does not.

Routings: operations, links and scrap

A routing holds the process requirements of a manufactured item. Once a production order exists, the routing governs how operations are scheduled on the order's own routing lines — the master record is copied, not referenced, so later changes to the routing do not rewrite orders already in progress.

Two mechanisms inside routings deserve attention because they change behaviour significantly.

Routing links connect specific components to specific operations. Two benefits follow. Components can be consumed when their linked operation starts rather than when the whole order is released — just-in-time flushing rather than dumping every material at once. And in the production journal, linked components appear next to the operation they belong to, which makes shop-floor posting far less error-prone.

Scrap appears in two places and they do different jobs. Scrap on production BOM lines increases the component quantity required. Scrap fields on routing lines affect both scheduling and costing. Confusing them produces material shortages that look inexplicable until someone traces the calculation.

Production order statuses

An order moves through four statuses, and each exists for a reason.

Orders can be created three ways: manually on the production order page, from sales order planning when you build to order, or in bulk from the planning worksheet after a supply planning run. Most companies use the third for regular production and the second for one-off jobs.

Flushing methods: how components leave stock

The flushing method on each component decides when consumption is posted, and it is the setting that determines how much manual work the shop floor does.

• Manual — someone posts consumption explicitly. Maximum control, maximum effort.
• Forward — components are consumed when the operation starts.
• Backward — components are consumed when output is posted.
• Pick variants (Pick + Forward, Pick + Backward, Pick + Manual) — used where warehouse picks control movement to the shop floor.

Where bins are in use, three bin codes on the work or machine centre carry this through: an open shop floor bin for manual and forward or backward flushing, a to-production bin for pick-based methods, and a from-production bin that receives finished output and flows onto the production order line at the final operation.

Where product cost actually comes from

Cost accumulates on the production order from three sources: consumed materials at their inventory cost, capacity time at work and machine centre rates, and subcontracting charges where an operation is performed outside.

The costing method chosen on the item — FIFO, Average, Standard and the rest — governs how material cost is valued. This is the decision that cannot be reversed after transactions exist, so it belongs in the design phase, not the configuration phase. It is covered separately in inventory costing methods.

Standard costing deserves a note for manufacturers: it makes variances visible by design, separating price variance from usage variance. That is exactly what a factory wants to see, and exactly what an average-cost setup hides.

What to settle before configuration starts

1. Costing method. Irreversible once transactions are posted.
2. BOM depth. How many levels of subassembly genuinely need tracking, and which can be phantom items exploded during planning.
3. Who posts on the shop floor — supervisor, operator, or a terminal — because this determines flushing methods more than any technical consideration.
4. Scrap policy. Where it is recorded and who confirms it.
5. Whether time standards exist. Routings without realistic setup and run times produce schedules nobody believes, and disbelieved schedules get abandoned.
6. Subcontracting. Whether external operations sit inside the routing or are handled as purchases.

See what this looks like for manufacturing companies.

Frequently asked questions