Pilot daily WMS-to-client inventory reconciliation

Every morning, the client sends an ERP export and the warehouse replies with a WMS file. A controller spends hours aligning item codes, explaining held stock and asking IT whether yesterday's receipts reached the ERP. By the next day, unresolved differences have disappeared into another workbook.

A useful reconciliation pilot produces a repeatable comparison and an owned exception queue for one client. It should explain the difference and support its authorised resolution. Automatic stock adjustments are outside the first scope.

Agree the population before the interface

Specify client ownership, site, SKU mapping, unit, location detail, stock statuses and the daily boundary. Decide how to treat receiving, picked stock and transit. Record who can change these definitions and how an old result remains reproducible after a change.

Microsoft's warehouse integration guidance includes dimension-specific reconciliation and cautions about duplicated updates from overlapping feeds. That makes the data boundary part of the design, not a final report setting. Microsoft Dynamics 365 — Integrating warehouse management with an external ERP.

Start with approved exports if supported APIs are unavailable. The pilot can still demonstrate comparison quality without claiming a live connection. Identify extraction time and source coverage so a partial file cannot masquerade as a complete warehouse balance.

Retain the inputs behind each run

For each run, store the source-file or extract identity, extraction timestamp, covered period, row counts, mapping version and comparison-rule version. Restrict access according to the client's data agreement.

Use a stable run identity for the same source pair and configuration. A rerun should reproduce the comparison rather than create another set of apparently new issues. When a source is corrected, record a new version and show what changed.

Reconcile the union of the two input populations. An inner join that keeps only matching item codes can make an incomplete file look perfectly reconciled. An absent row means zero only if the agreed export contract establishes that meaning and completeness checks pass; otherwise it is missing information.

Prove the exception categories with a small dataset

In this illustrative pilot, replay five completed days for two explicitly authorised client datasets with 20 SKUs each. Keep the clients' records segregated. The second dataset tests ownership isolation; operational rollout can still begin with one client.

Do not mark all late events as harmless. Each timing difference needs a reference that is expected to arrive or a defined follow-up. If it never arrives, the case must remain visible or change category through a recorded decision.

Follow one difference across two daily runs

Use this illustrative row within the test set. Client A's SKU K7 has 12 cases in the WMS and 118 each in the ERP at the same cutoff. The approved mapping is ten each per case, so the comparable WMS quantity is 120 each and the difference, WMS minus ERP, is +2.

The two units are part of the original 120, not a new WMS receipt on the following day. Closure requires the destination reference for R77 and a comparable balance. If the totals happen to agree because an unrelated adjustment adds two units, the missing handoff still needs investigation.

If day two's ERP file is incomplete, retain the first run's last verified difference with a stale-data label and original detection date. Do not report either zero difference or a new physical variance from the incomplete input.

Design a queue that survives another day

The queue should hold client, item and dimensions; both source quantities; difference; cause category; evidence; owner; due action; and status. Preserve the original detection date when the same unresolved issue reappears tomorrow. Resetting age on every run hides persistent problems.

Separate “source corrected”, “awaiting destination confirmation” and “resolved in both records”. A warehouse correction is not the same as a completed ERP update. Closing the case should require the evidence appropriate to its cause, not merely a user clicking a green button.

Test more than a matching percentage

Use an independently reviewed expected result for every seeded case. Re-run the same extracts and confirm identical quantities and case identities. Then introduce a late receipt, changed mapping and approved adjustment separately; the system should explain each change.

A proposed acceptance gate requires every seeded material difference to be detected and routed, no automatic balancing entry, and no cross-client record exposure in controlled access tests. OWASP's object-level authorisation guidance is relevant to the records and attachments exposed through a reconciliation API. OWASP — Broken Object Level Authorization.

Measure manual review minutes on the same dataset, unresolved age, false exceptions and repeated causes. Keep the denominator stable when comparing the pilot with the baseline. A run that omits difficult SKUs should not appear more accurate.

Define support and recovery before scheduling

The integration owner monitors missing extracts and failed jobs. Inventory owners decide whether a result can be used operationally. A failed daily run should display the last valid date and the affected scope, rather than carrying yesterday's values forward as though they were current.

The stop procedure pauses new result publication and correction requests while preserving inputs. Resume from a known run with documented mapping versions. If a correction was sent elsewhere, reconcile its destination outcome before replaying it.

Begin with a supervised daily review. Expand to more clients or sites only when owners can resolve the queue and explain the sample balances without the implementation team interpreting every case.

Make the daily result an accountable conversation

The pilot succeeds when a stock difference has a stable identity, supporting evidence and a person who can move it towards resolution. The automation should reduce reconstruction work while preserving the controls over physical stock and commercial responsibility.

Next actions

1. Agree the client, stock dimensions, cutoff and source owners.
2. Assemble a completed manual period and independently label its differences.
3. Replay the comparison with mapping, duplicate, timing and access failures.
4. Run supervised daily reviews and measure unresolved age and effort.
5. Expand only after the source and destination correction paths are demonstrated.

For the daily reconciliation pilot, identify the two systems, extract formats, comparison cutoff and owners who can resolve the recurring differences.