Lot and Batch Traceability in the Warehouse: Preparing for Product Recalls

A customer calls to say a carton of imported sauce bottles has leaking caps. Another says the same about a different shop. Is it one bad carton, one bad production batch, or the whole shipment? If your warehouse records only “Sauce 500ml — 1,200 cartons,” you cannot answer that question. You end up pulling every unit from every shop, or worse, pulling nothing and hoping. Lot and batch traceability is the ability to answer “which units came from which production batch, and where did they go?” For importers of food, cosmetics, medicines, electrical goods and many other products, it is the difference between a contained problem and a business-wide one.

What traceability means in a warehouse

Traceability has two directions. Tracing backwards means starting from a problem product and finding its source: which shipment, which supplier, which production batch. Tracing forwards means starting from a known batch and finding every place it went: which customers, which shops, which dates. A common standard in food safety is “one step back, one step forward” — every business in the chain should know who supplied it and who it supplied. For an importer, the step back is the Chinese factory and its batch number; the step forward is the distributor, retailer or end customer.

This is different from stock rotation, although the two are related. FIFO and FEFO decide which stock leaves first, and our FIFO vs FEFO guide covers them. Traceability records which stock actually left, and to whom. You can rotate stock perfectly and still have no idea which batch a customer received.

Starting at the factory: getting batch numbers onto the goods

Traceability begins before the goods are shipped. If the Chinese factory does not print a batch or lot code on the product and on the carton, there is nothing for your warehouse to record. For food, cosmetics and similar packaged goods, a batch code and manufacturing or expiry date are usually printed as standard. For hardware, electrical items and household goods, factories often do not add lot codes unless asked. Write it into the purchase order and product specification: batch code format, position on the product, and position on the outer carton.

The carton marking is as important as the product marking, because warehouse staff record at carton level. Our guide to shipping marks and carton labelling covers what to put on the outer box. If one shipment contains several production batches, the packing list should show which cartons belong to which batch. Ask the supplier to do this as part of the order; it costs them little at the packing stage but is hard to reconstruct later.

Capturing lots at receiving

The receiving dock is where traceability is won or lost. When goods arrive, staff should record the batch number of each pallet or carton group, along with the shipment reference, the supplier and the receipt date. The data needs to go into whatever stock system you use — a warehouse management system, an ERP, or even a well-structured spreadsheet — linked to the storage location. Our guide to the goods receiving process explains the full inbound check.

Barcode or QR labels make this much faster and more reliable than handwriting, because scanning a batch code removes typing errors. The barcode and QR labelling guide covers how to set this up. Whatever tool you use, the principle is the same: a batch number should never enter a storage location without being recorded against that location.

Keeping the link during storage and picking

Traceability often breaks inside the warehouse rather than at the edges. Staff consolidate half-empty cartons from two batches into one to save space, a pallet is split and part of it moved without recording, or pickers take whichever carton is nearest rather than the one the system specified. Each of these events breaks the link between a physical unit and its batch record. Rules that help include: never mix batches in one location unless the system records both; when splitting pallets, relabel the new location; and pick by batch as instructed by the system, not by convenience. A clear bin location numbering system makes this practical.

Recording batches at dispatch

The forward trace depends on recording which batches went into each outgoing delivery. That means the delivery challan or invoice for each customer should carry the batch numbers of the goods on it, or the stock system should record them against the order. For businesses supplying many retailers, this record is what lets you call exactly the right customers in a recall instead of every customer. Our guide to the outbound dispatch process covers how to build batch numbers into dispatch paperwork.

How a recall works when traceability is in place

Suppose quality complaints point to one production batch of a cosmetic cream. With traceability, the sequence is: identify the batch from the complaint samples; look up every receipt of that batch and where it is stored; freeze remaining stock of that batch in the warehouse so it cannot be picked; list every dispatch that included it; contact those customers with the specific batch number; collect returned stock and record it against the batch; and share the batch details with the supplier as evidence. Other batches keep selling. In Bangladesh, regulated products such as food and medicines may also involve obligations to the relevant authorities, and it is sensible to check those with an adviser before a problem arises rather than during one.

Returned and quarantined stock needs its own clearly marked area and records, which ties into our guide to returns and reverse logistics.

Running a mock recall

The only way to know whether your traceability works is to test it. A mock recall is a practice run: pick a real batch number from a past shipment and see how quickly your team can list where every unit of it is today — in stock, dispatched, and to whom. Time the exercise and note where information was missing. Many businesses discover gaps the first time, such as dispatches recorded without batch numbers, or cartons that were merged. Fixing those gaps in a quiet week is far easier than discovering them during a real complaint.

How much detail is enough

Not every product needs the same depth of traceability. A food, cosmetic or medicine importer should record batch numbers at every step, because a quality or safety problem can affect health and a recall may be required. An importer of hardware or packaging may decide that recording the shipment reference against each dispatch is enough, because a problem is more likely to affect an entire shipment than a single batch. The right level depends on the risk of the product and what customers expect, and a sensible starting point is to ask: if a serious fault were found tomorrow, how narrowly would we need to identify the affected units? Whatever level you choose, apply it consistently, because a trace that works for some products and not others creates false confidence.

Common traceability mistakes

• No batch code on the product. If the factory does not print it, nothing downstream can fix that. Specify it in the order.
• Recording batches at receiving but not at dispatch. You can trace back but not forward, which is the half you need in a recall.
• Merging part cartons from different batches. Space saved today becomes a blind spot later.
• Relying on memory. The staff member who remembers which customer got which lot may not be there when it matters.
• Never testing. Traceability that has never been exercised usually has gaps. Run a mock recall periodically.

Traceability also supports better supplier management: when you can link complaints to specific batches, you can show the factory evidence rather than general dissatisfaction, which strengthens any claim under a quality assurance agreement.

DE International helps importers specify batch coding with Chinese factories and organise shipments so warehouse traceability works from day one. See our services, the China sourcing and buying agent service, the shop, or contact us to discuss a setup built around your products.