Negative On-Hand Correction SOP

Standard procedure for investigating, validating, and correcting negative on-hand balances in the WMS by reviewing receiving and picking transactions, identifying root cause, and documenting corrective actions before inventory adjustment.

Steps

• Identify the negative on-hand item
  The inventory control specialist verifies the item number, description, location, lot or serial number if applicable, and the exact negative on-hand quantity in the WMS. The specialist records the date, time, and source screen or report used to identify the variance.
• Contain further inventory movement
  The warehouse supervisor places the affected item or location on hold in the WMS, or applies the site-approved control method to prevent additional receipts, picks, or transfers from posting against the negative balance while the investigation is in progress.
• Review receiving transactions
  The WMS analyst reviews all receiving transactions for the affected item and location, including open receipts, partial receipts, quantity discrepancies, wrong item postings, and timing gaps between physical receipt and system posting. The analyst compares the receiving record to the supplier document, purchase order, and any exception notes.
• Review picking and transfer transactions
  The inventory control specialist reviews outbound picks, replenishment moves, internal transfers, and any manual adjustments for the affected item. The specialist checks for overpicks, duplicate confirmations, wrong location picks, unposted reversals, and transaction timing issues that could have driven the on-hand balance below zero.
• Verify physical inventory status
  The warehouse supervisor assigns a competent person to perform a targeted count of the affected item and location. The verifier compares the physical count to the WMS balance, records any count variance, and confirms whether the negative balance is supported by a real shortage or by a transaction error.
• Determine the root cause
  The inventory control specialist determines the most likely root cause based on the transaction review and physical count results. The specialist documents whether the negative balance was caused by receiving, picking, transfer, master data, timing, or manual entry error.
• Apply the approved inventory correction
  The authorized user enters the inventory adjustment in the WMS using the verified quantity and the approved reason code. The user includes the reference to the investigation record, count result, and root cause. The supervisor or designated approver reviews and approves the adjustment before it is finalized.
• Escalate unresolved discrepancies
  If the root cause cannot be confirmed or the discrepancy exceeds site tolerance, the warehouse supervisor escalates the issue to the operations manager, inventory control lead, or quality representative. The supervisor opens a non-conformance record and assigns follow-up actions for additional investigation.
• Record corrective actions and close the case
  The inventory control specialist documents the final root cause, correction applied, approver name or role, and any preventive actions such as transaction retraining, receiving process review, or WMS parameter correction. The specialist closes the case only after the WMS balance matches the verified status and all required documentation is complete.