Key Takeaway: Duplicate purchases are one of the easiest purchasing mistakes to prevent, and one of the most common in businesses where more than one person can place an order.
What's on This Page
Why Duplicate Purchases Happen
Without a shared, visible record of open purchase orders, two people can independently decide the same SKU needs reordering. Especially common when purchasing authority isn't centralized to one person.
The Fix
- Keep one shared, visible list of every open purchase order, not separate notes per buyer
- Check open orders before placing a new one for the same SKU
- Number every PO sequentially so duplicates are easy to spot after the fact too
A wholesaler eliminated near-monthly duplicate orders almost entirely just by making open orders visible to both buyers at once. See the full case study.
Other Cost Control Levers
- Negotiate from purchase history data, not memory (see Supplier Management Guide)
- Consolidate small, frequent orders into larger, less frequent ones where lead time allows
- Capture early-order discounts through better purchase planning
For further reading, see the Association for Supply Chain Management (ASCM).
Checklist
- Set up one shared, visible list of all open purchase orders
- Require a check of open orders before placing a new one
- Number every PO sequentially
- Pull purchase history data before any supplier negotiation
- Identify small, frequent orders that could be consolidated
- Capture available early-order discounts through better planning
Common Mistakes
FAQ
What's the easiest cost-control win for most businesses?
Eliminating duplicate purchase orders, since it requires only a shared, visible record rather than any new negotiation or system.
How much can supplier negotiation actually save?
It varies, but negotiating from documented order history and price trends typically achieves better results than negotiating from memory alone.
Should small, frequent orders be consolidated?
Where lead time allows, yes. Larger, less frequent orders often qualify for better pricing than the same total volume split into small orders.
Is duplicate ordering really a common problem?
Yes, especially once more than one person has purchasing authority without a shared view of open orders.
Calculate This For Your Business
Related Guides in the Purchasing Academy
- Purchase Order Guide. the document that makes duplicates visible
- Purchase Workflow. structuring the process to prevent this
- Purchase Planning Explained. another guide in the Purchasing Academy