Every enterprise resource planning (ERP) vendor says it supports both make-to-order and make-to-stock production. Run a make-to-order (MTO) shop inside a system designed for make-to-stock (MTS), though, and the claim breaks down in year one. Custom jobs get forced through workflows built for repeatable runs.
Many discrete manufacturers, from automotive suppliers to electronics assemblers, run mixed-mode operations. They build configured orders to customer spec on the same lines that replenish standard items to forecast. Friction starts when the ERP forces one mode to behave like the other.
A better test is how ERP features hold up in both modes, from first quote to final job cost.
What is the difference between make-to-order and make-to-stock?
Make-to-order production starts when a customer places an order, so each job can carry its own specification, bill of materials and routing. Make-to-stock production builds standard items ahead of demand, based on a forecast, and ships orders from finished-goods inventory. MTO accepts longer lead times in exchange for customization, while MTS holds inventory so orders ship faster.
Where does make-to-order vs. make-to-stock friction show up in an ERP?
An ERP built around one mode shows the strain on the shop floor first. Stock modules push forecasts while order-driven modules chase live demand, and shared lines struggle to fit one-off jobs between batch runs. Finance feels it later, reconciling standard costs on stocked items against job-level profitability on custom work.
Your ERP shouldn’t assume every order is either a one-off or a repeat. At Syspro, we treat make-to-order and make-to-stock as two modes of one business. The features for each have to work inside one system. The sections below follow a job from the first quote to its final cost and show where each mode’s requirements meet.
What does quoting need from an ERP?
Quoting is where a customer’s expectation first meets your production capacity. On a make-to-order job, the price has to cover materials and operations nobody has costed before. A make-to-stock commitment depends on what’s in inventory or planned for replenishment. In both cases, the quote is where sales commits operations to a delivery date.
For make-to-order jobs
- Syspro Quotations & Estimates prices unique jobs from multi-level estimates (up to 14 levels of components and operations), rolling material, labor and outside-service costs into the quote.
- A product configurator applies rules that block invalid option combinations, then generates the price, bill of materials and routing for each configuration. Sales can quote tailored options without waiting on engineering.
- When the customer accepts, the quote converts into a sales order and job without re-entering data. The system also raises purchase orders for bought-out items.
For make-to-stock items
- Inventory Planning & Forecasting gives sales available-to-promise (ATP) data, so reps commit against current stock and planned supply.
- Requirements planning checks delivery dates against planned production and inventory levels, which keeps sales from over-committing.
In Syspro, both sides feed one plan. Open quotations can be included in Requirements Planning, weighted by their probability of acceptance. Likely custom orders then compete for materials and capacity in the same calculation that replenishes stock. Sales commits to dates the plant can hit.
What does production need from an ERP?
Production is where bespoke jobs and high-volume runs compete for the same work centers. Make-to-order work brings job-specific routings and design changes that can land mid-build. Make-to-stock output depends on batch efficiency and replenishment that arrives on time.
For make-to-order jobs
- Each make-to-order job carries its own routing, materials and labor, so tracking has to happen at the job level. Syspro Work in Progress (WIP) lets you issue material and post labor to longer jobs as work happens, or backflush them on shorter runs.
- In-process inspection, part of Syspro Quality Management, triggers checks at defined routing operations before work moves on and records the results against the job. Defects surface at the operation that caused them, ahead of final inspection.
- Engineering Change Control (ECC) matters when a customer changes a design mid-production. When an engineering change order opens, ECC can lock affected jobs and sales orders. That stops the shop floor from building an outdated revision while the change waits for approval.
For make-to-stock items
- Inventory Optimization, part of Inventory Planning, sets minimum and maximum stock levels from service-level targets, balancing demand variability against carrying costs.
- Syspro Warehouse Management assigns picking, putaway and cycle counting as system-generated tasks, including putaway of finished goods from production.
- License Plate Numbering tracks each pallet as one scannable unit, including mixed-item pallets and their lot details.
- Warehouse order policies set the rules Requirements Planning uses to suggest purchase orders, jobs and stock transfers for each warehouse.
Syspro runs make-to-order and make-to-stock jobs in the same WIP module. A custom order and a replenishment run compete for the same work centers in one capacity plan.
How should an ERP handle job costing?
Costing tells leadership whether the mix of custom and stock work makes money. Make-to-order costing has to capture what each job cost to build, engineering changes included. Make-to-stock costing tracks how batches and stocked items perform against standard.
For make-to-order jobs
- Job costing in WIP captures material, labor and overhead against each job and flags cost variances as they happen.
- Job-level variance reporting shows finance which custom jobs held their margin and which didn’t.
For make-to-stock items
- Standard costing sets the baseline for stocked items, and variance analysis measures actual production against it.
- What-if cost modeling shows how changes to material, labor and routing costs would move standard costs before you update them.
Finance needs both views in one place. Syspro lets you set the costing method by warehouse. Stocked items can run at standard cost while job costs post as actuals to the same general ledger.
How does an ERP earn its place in mixed-mode manufacturing?
An ERP earns its place in mixed-mode manufacturing when custom jobs and stock replenishment share one plan and one set of books. Independent analyst firm Technology Evaluation Centers (TEC) has certified Syspro’s mixed-mode manufacturing ERP. Because of Syspro, a configured order and a replenishment run can share work centers and a general ledger without either mode imitating the other.
Frequently asked questions
Can one ERP run both make-to-order and make-to-stock?
Yes, if both modes share planning, production and costing data. In Syspro, open quotations feed the same Requirements Planning run that replenishes stock. Both modes run as jobs in Work in Progress, and costing methods can be set by warehouse.
What is mixed-mode manufacturing?
Mixed-mode manufacturing combines make-to-order and make-to-stock in one operation, often on shared production lines. Some manufacturers add other models, such as assemble-to-order, to the mix.
Should make-to-order and make-to-stock use different costing methods?
Usually. Make-to-order jobs are costed on actuals so finance can see the margin on each order. Make-to-stock items typically run at standard cost, with variance analysis showing where production drifted from standard.
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Key takeaways
- Many manufacturers run make-to-order and make-to-stock side by side, and an ERP built for one mode forces workarounds on the other.
- At the quote, make-to-order needs multi-level estimates and configuration rules. Make-to-stock needs available-to-promise data and requirements planning that checks dates against supply.
- In production, job-level WIP tracking, in-process inspection and ECC keep custom work under control, while inventory optimization and warehouse management keep stock moving.
- Finance needs actual job costs and standard-cost variances in the same general ledger.
