Manufacturers often turn to software to resolve issues revolving around inaccurate inventory. But inventory management software is often just a band-aid that can't fix their broader problems.
8 Signs Your Inventory System Is Holding Back Production
Article from | MRPeasy
Why manufacturing inventory management is different
In manufacturing, inventory problems rarely stay in the warehouse. Missing materials and components can delay production, trigger emergency purchasing, push back delivery dates, distort product costing, and frustrate customers.
That is because manufacturing inventory is tied to much more than stock levels. Materials are connected to bills of materials, manufacturing orders, purchase orders, lead times, shop floor activity, subcontracting operations, and finished goods.
This is why manufacturing operations often continue to struggle even after implementing inventory management software. Knowing what is in stock is important, but it is not enough. You also need to know what is available for production, what is already reserved, what is needed for upcoming jobs, and whether you can actually make and deliver what has been promised.
9 signs your inventory system is holding back production
Here are nine signs your inventory system is not just tracking stock poorly, but actively holding back production.
1. Production stops even though the system says materials are in stock
One of the clearest signs of an inventory system problem is when production cannot start because a component is missing, even though the system says it is available.
This usually happens because the system shows general stock levels but does not properly account for reservations, open work orders, purchase orders, scrap, returns, or materials already allocated to other jobs.
For example, you may technically have 500 units of a component in stock – but 300 are reserved for another production order, 100 are in quality inspection, and 80 are in the wrong location. On paper, the part looks available. In reality, production has only 20 usable units.
2. Your team still uses spreadsheets to plan production
If your inventory system does not support production planning, someone in the company will usually fill the gap with spreadsheets. Before long, production depends on a patchwork of disconnected files.
It’s not that spreadsheets are bad. Spreadsheets work just fine for some small companies. The problem with spreadsheets is that they don’t scale well. Every single change has to be manually updated, and every manual update creates room for error.
Are production schedules generated automatically according to material and labor availability? If an order changes, does the production plan update automatically? If a supplier delays a delivery, does it reflect instantly in the schedule? If a component is used on another job, does the planner immediately see the shortage? If not, your inventory system is not supporting production.
3. Purchasing is always reacting to shortages
Another sign your inventory system is holding production back is constant last-minute purchasing. Your team may know stock levels, but still struggle to answer practical production questions like:
- What materials will we need next week?
- Which components should we reorder now?
- Which supplier delays will affect current work orders?
- Which items look fine today but will run out after the upcoming jobs?
Inventory management software can usually show what is below the reorder point. But manufacturing purchasing needs more than reorder points. It needs demand-driven material planning based on sales orders, forecasts, bills of materials, lead times, current stock, open purchase orders, and planned production. Without that, purchasing becomes reactive. Buyers only act once shortages are visible, and by then production may already be at risk.
4. BOM changes keep creating inventory confusion
In manufacturing, inventory accuracy depends heavily on bill of materials accuracy. If a product’s BOM is outdated, incomplete, or managed outside the inventory system, material planning quickly breaks down. Production may consume the wrong components, purchasing may order outdated parts, and costing may be based on old material structures.
This becomes especially difficult when products have multiple levels, variants, revisions, or configurable options.
For example, a finished product may include subassemblies, each with its own components. If your inventory system only handles simple stock items, it may not properly understand the relationship between raw materials, subassemblies, and finished goods.
The result is confusion that permeates throughout departments. Materials may look available at one level but be missing at another. Subassemblies may be counted incorrectly. Engineering changes may not reach purchasing or production in time. The finance department may record the wrong costs. All these mistakes can pile up, with far-reaching consequences.
5. Sales promises delivery dates that production cannot meet
Inventory problems often show up first in production, but they also affect sales. If sales teams do not have reliable visibility into stock, capacity, and production schedules, they may promise delivery dates that are difficult or impossible to meet.
This is especially common when systems are disconnected. Sales sees finished goods or general stock levels. Production sees material shortages. Purchasing sees supplier delays. Management sees delivery performance dropping but cannot easily identify why.
A standalone inventory system cannot always show whether a product can actually be made on time. To answer that, the system needs to consider raw materials, subassemblies, open work orders, production capacity, supplier lead times, and current demand.
6. Shop floor updates arrive too late
Inventory accuracy depends on timely shop floor reporting. If materials are consumed in production but only updated in the system hours or days later, the inventory data is already outdated. The same applies to finished goods, scrap, rework, and completed operations. This creates a familiar problem: the system is technically updated, but never quite current enough to trust.
When shop floor activity is reported late, planners and buyers are working with yesterday’s reality. They may think materials are available when they have already been consumed. They may miss scrap-related shortages. They may not know which jobs are delayed until the delay has already affected delivery.
7. Product costs are unreliable
If your inventory system is disconnected from production, your product costing may be incomplete or inaccurate. You may know how much you spent on the materials, but not the true cost of making the finished product.
Manufacturing costs include raw materials, components, labor, subcontracting, overhead, scrap, and rework. If those elements are managed in separate spreadsheets or systems, it becomes difficult to understand actual production costs.
For example, a product may look profitable based on material cost alone. But once labor, machine time, waste, and overhead are included, the margin may be much lower than expected.
8. Your system tells you what you have, but not what you can make
This is the main difference between inventory management software and manufacturing ERP software. Inventory management software usually focuses on stock control. It helps answer questions like:
- What do we have?
- Where is it?
- How much is there?
- What needs reordering?
While those are important questions, manufacturers need to go further.
They also need to know:
- What can we produce with the materials we have?
- Which materials are already booked for production?
- What materials are missing for upcoming jobs?
- Which work orders are at risk?
- What should purchasing order to support the production plan?
- How will demand affect future stock levels?
- Can we meet the promised delivery dates?
- What will the finished product actually cost?
These are manufacturing questions, not just inventory questions. And if your current system cannot answer them, it may not be the right kind of system for your business anymore.
Why inventory management software is often not enough for manufacturers
Many manufacturers begin by searching for inventory management software because the symptoms look inventory-related:
- Materials are missing
- Stock counts are wrong
- Reordering is inconsistent
- Warehouse visibility is poor
- Finished goods are hard to track
These are real inventory problems, so it seems logical to look for an inventory system. But manufacturing inventory is different from retail, wholesale, or distribution inventory.
Manufacturers not only buy and sell stock. They transform materials into finished goods through a controlled production process. Raw materials become components. Components become subassemblies. Subassemblies become finished products. Along the way, materials are consumed, moved, scrapped, substituted, inspected, and costed. This means inventory cannot be managed properly as a separate function. It has to be connected to the way products are made.
A general inventory management system can be useful for tracking stock levels, locations, movements, and reorder points. But it may not be built to manage the deeper manufacturing logic behind that stock. Manufacturers need to connect inventory with production and that is where manufacturing ERP software becomes the better fit.
How manufacturing ERP software solves these problems
Manufacturing ERP software like MRPeasy is designed around the full manufacturing operation, not just the warehouse. Instead of treating inventory as a standalone stock list, it connects inventory with production planning, purchasing, sales, shop floor activity, and accounting.
This helps manufacturers answer not only “What do we have in stock?” but also “What do we need, when do we need it, what can we make, and what will it cost?”
Manufacturing ERP software provides answers to those questions by:
- Connecting inventory with bills of materials. Materials, components, subassemblies, and finished goods are linked in one system, making it easier to calculate requirements and avoid production based on outdated BOMs.
- Supporting material requirements planning. The system compares demand with available stock, open purchase orders, lead times, and planned production to identify shortages before they stop work.
- Improving production scheduling. Work orders can be planned around material availability, routing steps, workstation capacity, and delivery dates, reducing reliance on disconnected spreadsheets.
- Giving purchasing better visibility. Buyers can see what is needed for upcoming jobs, not just what is currently below the reorder point, helping reduce both shortages and overbuying.
- Keeping sales and production aligned. Sales orders, inventory, and production plans are connected, making it easier to set realistic delivery dates and avoid overpromising.
- Capturing shop floor activity more accurately. Material consumption, finished goods, scrap, and work order progress can be recorded as production happens, keeping inventory data more current.
- Improving traceability and quality control. Lot numbers, serial numbers, expiry dates, inspections, suppliers, work orders, and customers can be linked to improve control over quality issues and recalls.
- Making product costing more realistic. Material costs can be combined with labor, machine time, subcontracting, overhead, scrap, and rework to give a clearer picture of true production costs.
- Giving management one connected view of operations. Inventory, purchasing, production, sales, and finance work from the same data, reducing manual updates and helping teams make faster, better decisions.
In short, manufacturing ERP software helps manufacturers manage inventory as part of the whole production process. That is why manufacturers looking to improve production efficiency should look beyond standalone inventory management software and choose a system built specifically for manufacturing.
The content & opinions in this article are the author’s and do not necessarily represent the views of ManufacturingTomorrow
MRPeasy
MRPeasy is a seriously powerful and easy to use ERP software for small manufacturers that gives you everything you need to manage your manufacturing and distribution processes. Integrating sales, procurement, inventory, production, finances, and your team, it provides you with an accurate real-time overview of your operations. MRPeasy is trusted by 2200+ small manufacturers worldwide, 900+ of which are based in the US and Canada. Our users report a 54% average improvement in the overall performance of their business and a 42% increase in on-time deliveries. Try for free, no credit card needed.
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