Inventory 'illusion' and SLOB tools

A warehouse can look full on a screen and still leave a shelf empty in real life. Supply-chain posts this week pushed that mismatch — often called “phantom inventory” — into the spotlight. (relexsolutions.com) Phantom inventory is a records problem: the system says an item is available, but workers cannot find it on the shelf, in the stockroom, or at the job site. Relex said the error delays reorders and turns bad data into stockouts and lost sales. (relexsolutions.com) The same discussion revived a second term, slow-moving and obsolete inventory, usually shortened to SLOB. Incorta defined SLOB in January 2026 as stock that moves too slowly to justify its carrying cost, and said it often makes up 20% to 25% of total inventory value. (incorta.com) SLOB and phantom inventory are different failures. One ties up cash in goods that sit too long; the other blocks sales because the count is wrong and the business does not reorder in time. (incorta.com, relexsolutions.com) The accounting stakes are not just operational. International Accounting Standard 2 says inventories are carried at the lower of cost and net realizable value, which is why obsolete stock eventually has to be written down when it cannot be sold for its booked value. (ifrs.org) That is why spreadsheet-style SLOB reviews keep showing up in operations circles. Teams sort stock by age, usage, and demand so they can flag parts that have not moved for months, then discount, return, redeploy, or scrap them before the write-down gets larger. (abcsupplychain.com) The fix for phantom inventory is usually less about finance and more about counting and capture. The United States Government Accountability Office said accurate physical counts depend on disciplined processes, accountability, and timely records, not just software alone. (gao.gov) Software still matters when the records lag reality. Katana MRP said in January 2026 that inventory accuracy degrades when physical stock and digital records are not updated in real time, especially when separate portals and spreadsheets create multiple versions of the same item. (katanamrp.com) That helps explain why enterprise resource planning systems, or ERP systems, are getting attention in construction and manufacturing. Construction ERP vendors pitch real-time site-by-site material visibility as a way to cut over-ordering, shortages, and waste across multiple projects. (concorderp.com) Retailers have been chasing the same goal with item-level tracking. A GS1 US case-study summary said legacy shipment data contains preventable accuracy errors and argued that radio-frequency identification, or RFID, can remove them through more automated scanning. (gs1us.org) The thread running through all three ideas is simple: bad inventory data creates two opposite costs at once. Companies can end up short on the items customers need and long on the items nobody wants. (relexsolutions.com, incorta.com)