MYOB Acumatica Replenishment: How to Set Reorder Points and Safety Stock for Australian Distributors

MYOB Acumatica replenishment works per item and per warehouse. You pick one of two methods, Min./Max. or Fixed Reorder Qty., set a reorder point, and the Prepare Replenishment screen (IN508000) lists what to buy or transfer when available stock falls to that point. With the Moving Average forecast model on, it also calculates reorder point and safety stock from your sales and receipt history at a default 84% service level.

At a glance

• Who it is for: Australian wholesalers and distributors on MYOB Acumatica, or moving to it, who still decide what to reorder from a spreadsheet or a weekly stock report
• Problem it solves: stockouts on fast movers and dead stock on slow ones, usually because reorder points were typed in once at go-live and never recalculated
• Platforms: MYOB Acumatica (formerly MYOB Advanced) with the Inventory Replenishment feature; Multiple Warehouses for transfer replenishment
• Typical cost: configuration sits inside an implementation rather than a separate licence; MYOB quotes licences through partners, so see what MYOB Acumatica costs in Australia for the indicative ranges
• Typical timeline: the calculated parameters need sales and receipt history to work with; MYOB’s own worked example uses three months of sales, and a MYOB FastStart for wholesale distribution project reaches go-live in 12 weeks with the rules set
• Last verified: 14 October 2026 (MYOB Acumatica replenishment configuration guide)

Most reorder problems aren’t software problems. They’re arithmetic nobody has time to redo. A reorder point set in 2024 against a 14-day lead time is quietly wrong once the supplier starts taking 21, and the first anyone hears of it is a back order. The replenishment engine in MYOB Acumatica exists to redo that arithmetic for you. This post covers how it works, which method to use, how the system derives the numbers, and the settings that catch people out.

How does replenishment work in MYOB Acumatica?

Replenishment is a feature you switch on, not a module you buy. On the Enable/Disable Features form (CS100000) you turn on Inventory Replenishment, plus Multiple Warehouses if stock will move between sites. The MYOB Acumatica configuration guide then walks through a chain of forms, and it helps to know the chain because the settings cascade.

• Replenishment Classes (IN208800). One class per way you restock: Purchase (a purchase order to a supplier), Transfer (a transfer order from another warehouse), or a distribution centre pattern where purchases land at one warehouse and fan out by transfer.
• Warehouses (IN204000) and Item Classes (IN201000). Each warehouse gets a default replenishment class. Each item class gets default planning settings: source, method, seasonality and demand forecast model.
• Stock Items (IN202500) and Item Warehouse Details (IN204500). Items inherit the class settings, then you override per item and per warehouse. The reorder point, maximum quantity and safety stock that drive the calculation live on the item-warehouse record.
• Prepare Replenishment (IN508000). The working screen. It lists every item at a warehouse whose available quantity has fallen to or below its reorder point, with a suggested quantity to process, and creates replenishment requests.
• Create Purchase Orders (PO505000) and Create Transfer Orders (SO509000). Turn the requests into purchase or transfer orders.

The trigger is the Available quantity on Item Warehouse Details, not quantity on hand. Available already nets off sales order allocations, so a bin that looks full in the warehouse can still trip the reorder point if most of it is promised.

Min./Max. or Fixed Reorder Qty.: which replenishment method should you use?

MYOB Acumatica offers two replenishment methods, plus None, which is the default and means nobody is watching. The choice sits on the Inventory Planning tab of the stock item or item class.

Our rule of thumb for wholesalers: Min./Max. on the A and B lines where you know the service level you want, Fixed Reorder Qty. on items bought by the pallet or carton where the supplier dictates the quantity anyway, and None left in place only on obsolete stock you intend to run down.

How does MYOB Acumatica calculate reorder point and safety stock?

This is the part most sites never switch on, and it’s where the value is. Set the Demand Forecast Model on the item or item class to Moving Average, choose a Forecast Period Type (day, week, month or quarter) and how many periods to analyse, and set a Launch Date so the history starts where the item’s sales really started. The demand forecast model guide gives the formulas, and they’re standard inventory theory:

• Average daily demand. Total sales quantity across the analysed periods divided by the number of days, counting sales orders, sales returns as negatives, transfer orders and kit components.
• Average lead time. The system measures it from your purchase receipts: receipt date minus the requested date on the PO line, averaged across receipt lines, dropping any line more than two standard deviations from the mean. If a preferred vendor is set, only that vendor’s documents count. With no receipt history, it copies the Vendor Lead Time (Days) you typed in.
• Safety stock. NORMSINV(service level) multiplied by the square root of (average lead time times the standard deviation of daily demand) squared plus (average daily demand times the standard deviation of lead time) squared. In plain terms: buffer for how much demand wobbles and how much the supplier wobbles, scaled by how sure you want to be.
• Reorder point. Average daily demand times average lead time, plus safety stock.

The service level defaults to 84%, which MYOB’s guide calls the level to use so the coefficient isn’t distorted. Push it to 95% or 99% and safety stock climbs fast, because NORMSINV grows steeply at the top end. The guide’s own worked example sells 200 units a month over March to May with lead times of 20, 17 and 14 days at a 90% service level, and lands on a reorder point of about 131 units and safety stock of about 21.

You run the numbers on Calculate Replenishment Parameters (IN508500), review the suggested values on Apply Replenishment Parameters (IN509500) and apply the ones you accept. The step-by-step shows a lead time of 3.44 days measured from receipts rather than typed in, which is exactly the point. If you want to sanity-check the maths before go-live, our free reorder point, safety stock and EOQ calculator uses the same formulas and runs in your browser.

What does seasonality do to the calculation?

Replenishment Seasonality (IN206600) lets you define seasons with a factor. Sales inside a season are divided by its factor before the average is taken, so a Christmas run at factor 3 is normalised back to a base rate, and dates outside any season use a factor of 1.0. MYOB recommends configuring seasonality for one year only and keeping seasons from overlapping. Note that the standard deviation is still taken on actual sales, so a seasonal item keeps a bigger buffer than a flat one, which is the behaviour you want.

The sites that get burnt are the ones where the reorder points were set at go-live from a supplier’s quoted lead time. Twelve months later the supplier is shipping a week late and nobody has told the system. Letting MYOB Acumatica measure lead time from the receipts you’ve actually booked in is the single most useful thing in this whole feature.

Bill Alvarez, Practice Manager, Auboros

What goes wrong with reorder points in practice?

MYOB’s 2025 ERP trends research found 45% of Australian businesses say disconnected systems limit their growth, and reordering from a spreadsheet beside the ERP is the classic case. Even with the feature on, these are the settings we fix most often.

• Max. Qty. left equal to the Reorder Point. After you apply calculated parameters the system sets Max. Qty. to the reorder point. Under Min./Max. that means every replenishment orders just enough to climb back to the trigger line, so you reorder constantly in small lots. Set Max. Qty. to the reorder point plus a sensible cycle quantity.
• Demand setting too loose. The Demand Calculation setting decides what counts as demand. Hard Demand Only counts allocated, shipped and back-ordered sales order quantities; Item Class Settings uses the availability rule on the item class. Pick one deliberately, or two warehouses will plan on different definitions.
• No preferred vendor. Without one, lead time is averaged over every supplier you’ve ever bought the item from, including the emergency air-freight order. Set the preferred vendor and the measurement tightens.
• Vendor minimums not entered. Min. Order Qty., Max. Order Qty. and Lot Size on the vendor record are what round the suggestion into something the supplier will accept. Leave them blank and the PO arrives at the buyer needing hand edits every time.
• Transfers planned like purchases. Transfer replenishment uses the Transfer Lead Time from the item class, not supplier receipts. Interstate stock movements need a realistic figure there or the branch runs dry while the truck is on the Pacific Highway.

How do you turn replenishment requests into purchase orders?

Prepare Replenishment calculates in the base unit of measure. When you move the requests to Create Purchase Orders, MYOB Acumatica converts to the purchase unit, so ten base units bought in boxes of ten become one box on the PO. The buyer then works the order on Purchase Orders (PO301000) as normal, receipts it on Purchase Receipts (PO302000), and the inventory receipt updates available stock, which is what the next replenishment run reads.

Two points worth knowing before go-live. First, nothing is automatic until a person processes the screen; the requests are internal records, and the PO only exists once someone creates it. Second, the engine suggests quantities, not judgement. It won’t tell you that a line’s margin no longer covers the freight to restock it. That judgement layer is where an AI replenishment agent that drafts purchase orders can sit on top of the native rules, still with a buyer approving every order.

If you’re weighing up MYOB Acumatica for a distribution business, the replenishment engine is one of the reasons it belongs on the shortlist for ERP for wholesale distribution in Australia, alongside barcode scanning and warehouse management and the lot tracking covered elsewhere on this blog.

Goes well with

• MYOB inventory management in Australia: where MYOB Business and AccountRight stop, and what MYOB Acumatica adds
• MYOB batch tracking: lot numbers, expiry dates and recall traces in MYOB Acumatica
• How long a MYOB Acumatica implementation takes in Australia

Want your reorder points to update themselves?

We’re a MYOB Acumatica partner in Brisbane and an approved Queensland partner for FastStart Wholesale Distribution, so setting replenishment classes, service levels and vendor minimums for Australian distributors is part of how we run an implementation.

If your buying team is still working from a spreadsheet beside MYOB, book a free consultation and we’ll walk through what your sales and receipt history would give you on day one. No obligation, and if the answer is that your current reorder report is fine, we’ll say so.