A Taiwanese-owned factory operating in Vietnam for over a decade was tormented by inventory figures that kept them up at night: the highest monthly inventory discrepancy reached 15,000 pieces, with an estimated annual loss of about US$1.6 million. During the pandemic, the "three-in-place" approach (requiring management to direct operations remotely, relying on paper documents for on-site communication, interpreting handwritten labels by hand, and failing to properly manage scrapped and test products) meant that for bonded factories, this was not just a cost issue, but also a matter of fines and reputational risks.

The problem isn't the system, but the ground rules.

This factory did implement ERP; the real problem was that "the rules were not written into the actual work."

Time lag between paper records and the system, inconsistent warehouse signage, lax access control, and a chaotic traceability architecture—all these small flaws eventually converged into a huge inventory discrepancy. The supervisor succinctly pointed out the crux of the matter: "Information technology doesn't start with computers, it starts with the ground."

Six actions that give the warehouse both a "door number" and "navigation".

01/ Warehouse location numbering

Treat warehouses like city planning: first, zone them into bonded/non-bonded areas, then fully code shelves, counters, and aisles to establish a "one item, one location" coordinate system. Upgrade from finding materials by memory to picking materials using navigation.

02 / Label Standardization + QR

Ditch the old handwritten work methods. The system prints product name, part number, specifications, quantity, batch number, and QR code at once. The information is scannable and readable, eliminating copying and recognition errors. Information flow no longer depends on individuals.

03/ Supplier Collaborative Pre-labeling

The labels arrive before the goods. Suppliers pre-label according to our templates, and the dock staff can simply scan and accept the goods, eliminating the need for secondary transcription and manual verification. This ensures that the supply chain is aligned from the moment the goods enter the factory.

04 / Project-Driven Material Requisition

The system automatically aggregates material requisition requirements from the production plan, generates a material requisition form including storage location and QR code, and plans the shortest route; material issuance and receipt are confirmed point-to-point before the transaction is posted, ensuring clear responsibilities and a clear path.

05/Shift work report + fixed volume and quantity

Instead of waiting until the next day to report work, reports are now submitted immediately at the end of each shift, reducing the time lag from 24 hours to approximately 2 hours. Standard containers have been introduced for bulk raw materials that are difficult to inventory, and the system of "container = quantity" has been changed to control inventory, making inventory counts faster and more accurate.

06 / Batch number reconstruction, tracing back along a single line

Abandon the vague practice of "same day, same batch"! Instead, use the following:

1. Raw materials use the original manufacturer's batch number
2. Packaging materials are tied to the purchase order number.
3. Semi-finished products are labeled with "mold code + production date".
4. Finished product linking order/work order

In case of an incident requiring retrospective analysis, the system can trace back to the raw materials, molds, and machines from the finished product, moving from reactive remediation to proactive risk control.

Numbers Speak: From Black Box to Glass House

After the improvements, the monthly inventory difference decreased from an average of approximately 6,000 units to less than 60 units; the annual losses, previously measured in monetary terms, were significantly reduced. More importantly, the fundamental structure of the business changed:

• Real-time: Work reports are submitted by each shift, and inventory and work-in-process are close to real-time;
• Standard: Unified storage location/labeling; picking relies on systems, not human judgment.
• Accountability: Both the sending and receiving of goods must be confirmed, and the posting of accounts must be traceable;
• Compliance: Handling scrapped/tested products through proper procedures, remaining calm and unafraid of customs inspections;
• Traceable: The batch number structure provides evidence for both customers and internal investigations.
• Conclusion: First, level the ground, and the data will naturally run.

A factory-wide smart logistics system (WMS) is not a dazzling "big system," but a series of practical production and manufacturing metronomes: putting nameplates on warehouse locations, writing labels in grammatical notation, bringing suppliers into the rhythm, pushing work reports to each shift, and converting batch numbers into a language that can answer questions.

Once order is established on-site and data is real-time and traceable, the warehouse transforms from a maze into a map, and the factory returns from chaos to a proper rhythm.

If your factory warehouse is struggling with discrepancies between records and actual stock, incorrect material requisitions, or difficulties in tracing, consider starting with these six steps. Get the ground in order first, then the computer can truly shine. Or contact us for consultation services!