ERPNext Manufacturing, Singapore

Routings and job cards for high-mix machining and assembly

A Singapore precision shop may run hundreds of active part numbers in small quantities, with setups that take longer than the run itself. Routing design in ERPNext Manufacturing has to cope with that variety without becoming unmaintainable.

What I put in place:

• Workstation types: CNC milling, turning, deburring, assembly, inspection and test, with individual machines as workstations under each type so work can move between similar machines.
• Routings per part family: a family route reused across similar parts, with operation times adjusted per BOM rather than a new routing for every part.
• Setup separate from run: job cards that capture setup time and run time separately where it matters, because quoting errors usually hide in setup.
• Operator entry: barcodes on traveler documents so operators start and stop job cards quickly, with supervisor review at shift end.
• Work order per customer order line: so cost and progress are visible per customer PO.

Capacity planning in ERPNext gives a useful view of load per workstation, but it is not finite scheduling. Shops that need machine-by-machine sequencing to the hour usually keep a scheduling tool or a planner's board alongside. I say that early so nobody expects ERPNext to replace it.

After the pilot, I compare quoted hours with job card actuals for a sample of parts. That comparison often changes how the shop quotes, which is where much of the value lies.

Customer-supplied parts and contract manufacturing

Contract manufacturers in Singapore regularly build with materials their customers own: consigned components for an assembly, a brand owner's packaging and ingredients, or a semiconductor customer's housings sent for machining. Mixing those with your own stock causes two problems: inventory is overstated, and product cost includes parts you never paid for.

ERPNext has a customer-provided item flag. Such items are received against a customer-provided material request at zero valuation, stored in a separate warehouse per customer if required, and consumed on work orders like any other material. The settings I agree with your team:

1. Which items are always customer-provided, and which are sometimes bought by you when the customer runs short.
2. How shortages, damage and excess consigned stock are reported back to the customer.
3. Whether consigned stock is counted with yours or in a separate cycle.
4. How the conversion charge is invoiced, often as a service item on the sales order.

Many customers audit consigned stock periodically and want reconciliations of what was received, consumed, scrapped and returned. I make sure a report produces that without spreadsheet work. The general principles behind this are part of my ERP business analysis approach, and the wider ERPNext picture in Singapore, including GST and payroll, is on the ERPNext consultant Singapore page.

Serials, revisions and records customers audit

Singapore manufacturers supplying semiconductor, medical, aerospace or food customers are asked to prove what went into each delivery and how it was checked. The records need to be in the system, not in a folder of PDFs.

The traceability design I usually test:

• Serial numbers for assemblies and higher-value parts, created on the manufacture entry and printed on labels.
• Batches for raw materials, components and food lots, with supplier certificates attached at receipt.
• BOM revisions that match drawing revisions, with the BOM used recorded on every work order so a part can be traced to the revision it was built to.
• Quality inspection templates with measured parameters and limits at receipt, in process and before shipment.
• Non-conformance records using ERPNext's quality management features to log issues, actions and closure.

ERPNext is not a document control system or a full quality management suite. Controlled drawings, procedures and formal approvals for a regulated quality system usually live elsewhere, with ERPNext referencing them. Where your customer requires software validation, as some medical customers do, discuss early whether an open-source ERP can meet that expectation. I raise these limits during gap analysis rather than after go-live.

Regional subcontractors, GST and cost rates

Singapore shops often send work to subcontractors locally and in nearby countries: plating, anodizing, heat treatment, PCB assembly or simple machining. Material may cross borders in both directions.

In ERPNext, I set this up as subcontracting orders with material transferred to a supplier warehouse, plus a transit step where goods are shipped abroad. The receipt brings processed parts back with the subcontractor's charge added to cost. I agree how freight and import charges are captured, usually through landed cost, and how material held at each subcontractor is confirmed periodically.

GST on imports and on cross-border services is administered by IRAS, and the correct treatment for your business is for your tax advisor to determine. My concern is that recoverable GST stays in the tax account rather than inside item valuation. InvoiceNow affects how sales invoices are sent and received rather than how production runs, so I treat it as part of the wider finance integration plan; check current requirements and timing with your advisor.

Cost rates deserve honest attention. Because wages and floor space cost a great deal here, workstation hour rates should include direct labor, machine cost and an agreed share of overhead. The valuation method, moving average or FIFO, is agreed with finance, and the first months include a review of quoted versus actual cost. Workforce cost data typically comes from your payroll system rather than ERPNext.

Hosting, support and when ERPNext is not enough

Three support models are realistic for a Singapore manufacturer. Frappe Cloud manages the platform and updates; confirm which regions are available and whether that meets your customers' data handling expectations under the PDPA and their own supplier rules. A self-hosted site on a Singapore cloud region gives you control, but someone must apply updates, test them and verify backups. An implementer can host and support under one contract, which works when response times and update testing are written into the agreement.

ERPNext Manufacturing is the wrong fit when:

• SMT lines or automated cells need a manufacturing execution system with real-time machine data.
• On-time delivery hinges on sequencing a crowded machine park to the hour.
• A regulated customer requires validated software and vendor-backed quality documentation.
• A multi-country group needs deep statutory localization for several subsidiaries.
• Nobody inside the business will own the system.

When those apply, I compare options through ERP evaluation and the best manufacturing ERP comparison. See the Singapore hub and my ERP consultant Singapore page for the rest of my remote work there.