Your Shopee listing says 3 in stock. So does Tokopedia. You own 3.
Two buyers each order 2 units in the same minute. One order gets cancelled, and your shop rating takes the hit.
An inventory mgmt system stops that. Here is how one works.
What Is an Inventory Mgmt System?
An inventory mgmt system (IMS) is software that keeps one master stock count per SKU and updates it after every sale, receipt, return and adjustment. It then pushes that count to each channel you sell on, such as Shopee, Tokopedia, Lazada and TikTok Shop, so no listing shows stock you do not have.
You will also see it called a stock management system or an inventory system. The name changes. The job does not. It is the one place that knows what you own, where it sits, and how much of it you can safely sell.
For a seller with two or more marketplace stores, the value is not the record keeping. It is the rules the system applies to the record. A spreadsheet stores numbers. An IMS acts on them.
Every IMS tracks four numbers for each SKU:
| Number | What it means | Example (illustrative) |
|---|---|---|
| On hand | Units physically on your shelf | 10 |
| Reserved | Units in orders that have not shipped yet | 3 |
| Incoming | Units on a purchase order from your supplier | 20 |
| Available to sell | On hand, minus reserved, minus your safety buffer | 10 - 3 - 2 = 5 |
Only the last number should reach your marketplace listings. Sellers who publish “on hand” instead oversell every time an order is still sitting unpacked on the packing table.
How Does an Inventory Mgmt System Stop Overselling Across Channels?
The system keeps a single master count and pushes the “available” number to every connected channel after each order. Sync speed differs by vendor and sometimes by plan tier, so during 9.9, 11.11 and 12.12 (Harbolnas) sales you should hold a safety buffer per SKU. Confirm each vendor’s documented sync interval before you buy.
Sync starts with mapping. Each channel listing must point to one master SKU. If a shirt is “Kaos Polos Hitam L” on one channel and “Black Tee L” on another, the system cannot match them. Fix the names first, then connect the channels. A mismatched SKU is the first thing to rule out when a sync fails.
Here is what happens after a sale:
- A buyer orders 2 units on Shopee.
- Shopee passes the order to the IMS through its API connection.
- The IMS reserves 2 units against the master SKU.
- It recalculates “available” and updates the Tokopedia, Lazada and TikTok Shop listings.
Step 4 is where vendors differ. Some update within seconds. Others run on an interval. Even a gap of a few minutes is enough to oversell when a TikTok Shop live session or a Harbolnas sale sends orders in bursts.
The fix is a safety buffer. Publish “available minus buffer” instead of “available”. Example: with 8 units available and a buffer of 2, every channel shows 6. Raise the buffer on campaign days and lower it afterwards.
Some tools also let you cap stock per channel. That keeps a viral live sale from draining units you promised to a bulk buyer elsewhere. Check whether your tool supports it.
Marketplace tools will not do this for you. Shopee’s seller tools (start at the Shopee Seller Education Hub) and the Tokopedia seller dashboard each cover their own platform only. That is fine for a single-channel shop. It is the reason multi-channel sellers need a layer above them.
How Does an Inventory Mgmt System Handle Purchases, Returns and Failed COD Orders?
Stock does not only leave. An IMS also records supplier receipts, customer returns and cash-on-delivery parcels that bounce back. Each movement carries a reason, so when the shelf count and the system disagree, you trace the gap to a specific transaction instead of guessing.
Receiving. When supplier stock arrives, you receive it against a purchase order. The IMS adds the units to “on hand” and clears the “incoming” line. Scan barcodes at this step. A short delivery caught on day one is a supplier conversation. Caught at month end, it is a mystery.
Returns. A returned parcel is not automatically sellable stock. Inspect it, then send it to one of three places: back to available, to a damaged bin, or to write-off. Until it is physically back with you, keep it in a holding status so you do not resell a unit still travelling with a courier.
Failed COD. Cash on delivery is common in Indonesia, and a refused or undelivered parcel returns days later. In that window the unit is neither with the buyer nor on your shelf. A good IMS lets you mark it “in transit back” and only adds it to available after you scan it in. Return timelines differ between J&T Express, JNE, SiCepat and Anteraja, so check how your tool records each one.
Adjustments. Damaged goods, influencer samples and miscounts all need a stock adjustment. Log each one with a reason. An adjustment without a reason is how a stock record stops being trusted.
Not sure where your reorder point should sit? Run your own numbers in the reorder point calculator. Free to use.
What Reports and Alerts Should an Inventory Mgmt System Give You?
At minimum: stock by SKU and channel, a full movement history, sales velocity, and low-stock alerts tied to a reorder point. The reorder point equals average daily sales times supplier lead time, plus safety stock. A tool that flags “low stock” without that logic leaves the maths to you.
Reports are where cheap and capable tools separate. Here is what to expect and the decision each one supports:
| Report | What it shows | Decision it drives |
|---|---|---|
| Stock by SKU and channel | On hand, reserved and available per listing | What to publish and what to pack |
| Movement history | Every stock in and out, with time and reason | Where a count went wrong |
| Sales velocity | Units sold per day or week, per SKU | What to reorder and what to clear |
| Low-stock alerts | SKUs that have dropped below the reorder point | When to place a purchase order |
| Margin by SKU | Cost against selling price (accounting-linked tools) | Which products deserve your cash |
The alert is only as good as the reorder point behind it. The formula:
Reorder point = (average daily sales × supplier lead time in days) + safety stock
Example with illustrative numbers: a SKU sells 6 units a day, your supplier needs 10 days from order to shelf, and you want 12 units of safety stock. Reorder point = (6 × 10) + 12 = 72. When stock reaches 72, place the order.
Lead time is the input that is easy to get wrong. Count from the day you place the order to the day the units are on your shelf, including courier or import time, not the supplier’s promised dispatch date.
Work through your fastest-selling SKUs first with the reorder point calculator and the safety stock calculator. For the wider picture on stock control, see our ecommerce inventory management hub for Indonesian sellers.
Do You Need an Inventory Mgmt System, and What Does It Cost in Indonesia?
You likely need one if you sell on two or more channels, have cancelled an order because of an oversell, or update stock by hand every day. Pricing models vary. Jubelio’s pricing page, for example, lists Rp150 per order processed, with terms applying. Compare each vendor’s total monthly cost at your own order volume.
Five signals say it is time:
- You sell on two or more channels.
- You have cancelled an order because you sold stock you did not have.
- Someone on your team updates stock by hand every day.
- Your stock-opname count and your records disagree every time.
- Your stock sits in more than one place, such as your home, a small warehouse and a 3PL.
Any one is a reason to look at software. Two or more means you are already late.
If none apply, do not buy yet. One channel and a modest catalogue can run on the marketplace’s own stock view or a well-kept spreadsheet. Pay for software when the manual work costs more than the subscription.
Work out cost per order, not per month. Jubelio’s pricing page lists Rp150 per order processed, with terms and conditions applying, and includes unlimited SKUs, users and locations. At that listed rate, 1,000 orders in a month would come to Rp150,000, before any minimums or add-ons in the terms. Other vendors may price by plan tier, store count or feature set, so put every quote on the same order volume before you compare. Our software inventory comparison lines up Jubelio, Ginee, Sellercraft and Anchanto side by side.
One boundary to know. An IMS answers “how many do I have, and can I sell it?” A warehouse management system (WMS) answers “where is it, who picks it, and in what order?” Jubelio’s pricing page lists a WMS and accounting alongside its omnichannel features, so some vendors sell both together. Most sellers start with the IMS and add warehouse functions as the operation grows. Our WMS systems guide covers that step.
Before you sign with any vendor, ask:
- Which channels connect natively, and which need a workaround?
- What is the documented sync interval on my plan?
- How does it record customer returns and failed COD parcels?
- How is pricing calculated: per order, per store, per user, or by feature tier?
- Can I export my full stock and movement history if I leave?
Setting one up starts with a clean SKU list and a physical count. The system inventory guide walks through it, from the first stock count to the test order.
Frequently Asked Questions
What is an inventory mgmt system?
An inventory mgmt system is software that tracks how many units of each SKU you own, reserves stock when orders arrive, and updates every sales channel. For Indonesian sellers it usually connects Shopee, Tokopedia, Lazada and TikTok Shop, so one sale on any channel lowers the available count everywhere.
Is an inventory mgmt system the same as a WMS?
No. An inventory mgmt system tracks quantities and syncs them across channels. A warehouse management system (WMS) directs physical work: storage locations, picking routes and scanning at each step. Some vendors bundle both, as Jubelio’s pricing page does. Small teams with one storage point often need only the first.
How much does an inventory mgmt system cost in Indonesia?
It depends on the pricing model. Jubelio’s pricing page lists Rp150 per order processed, with terms applying, so 1,000 orders would come to roughly Rp150,000 at that rate. Other vendors may charge by plan tier or store count. Compare the total at your own order volume, not the headline price.
Can I use Excel instead of an inventory mgmt system?
Yes, if you sell on one channel and can update the sheet within minutes of each order. It stops working when you add a second channel, because each marketplace keeps its own count and a spreadsheet cannot update them. That gap is where overselling comes from. Treat the first cancelled order as your signal to switch.
Keep Reading
- System Inventory: How It Works for Indonesian Sellers – a step-by-step setup guide, from first stock count to test order
- Software Inventory: What Indonesian Ecommerce Sellers Need to Know – Ginee, Jubelio, Sellercraft and Anchanto compared
- Ecommerce Inventory Management for Indonesian Sellers – the full hub on stock control, order sync and fulfillment