GMR Error Before the Port - 7 Things to Check Before Your Transport Gets Stuck

A GMR error usually surfaces at exactly the moment when it's too late for a calm fix. The driver is on the way to the port, the forwarder is under time pressure, and the company assumes that since the number was created, the matter is closed. Unfortunately, that's exactly where hold-ups and costly corrections happen.

This guide is for hauliers, forwarders and trading companies who want to check their GMR before reaching the port. If you need a broader overview of the topic, also see GMR vs ENS - what's the difference and what to prepare before departing for the UK.

1. Check whether the route actually requires GVMS

The first mistake happens at the level of assumptions. Not every route works the same way. If the movement passes through locations using the Goods Vehicle Movement Service, the GMR becomes a critical element and must be based on correct references. See what GVMS is and how to get a GMR number.

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2. Verify the vehicle and trailer details

One of the most common causes of problems is a mismatch between the data used to create the GMR and the actual vehicle or trailer. Changing the registration "at the last minute" without updating the GMR can stop the whole movement.

3. Make sure you're using the correct references

Under the Common Transit Convention, the GMR needs the correct transit MRN. GOV.UK stresses that you should not enter the import declaration MRN into the GMR instead of the transit MRN, nor add both where that's not correct.

4. Check whether ENS also applies

The GMR alone does not fulfil the safety and security obligation. If the movement requires an entry summary declaration, you need to separately confirm this obligation has been met. For entry into GB the carrier files the ENS in S&S GB; since 1 June 2026 it cannot be added to a UK transit declaration (S&S GB or ICS2). Otherwise the GMR number may exist, but the movement will still run into an operational problem.

5. Verify the full set of transport documents

• commercial invoice,
• packing list,
• MRN or T1, if applicable,
• haulier and route details,
• information on the port and movement model.

6. Check the status of the GVMS service

If there are issues on the service side, a haulier may wrongly assume the problem lies with the documents. Before escalating, it's worth checking the official GVMS availability page and confirming there are no current disruptions; how to read a GMR status is covered in how to check GMR status in GVMS.

7. Establish what the driver should show, and at what point

Even a correctly prepared number may not help if the team isn't clear on what the driver needs to show and where to check the movement result. GOV.UK also notes that on arrival in the UK, the GMR must be used in the checking service to see whether you need to report for a check (when to report for inspection).

What to prepare before contacting a customs agency

• GMR number,
• vehicle and trailer details,
• MRN / T1 / other references,
• a short description of the problem or error message,
• information on where the transport currently is and the deadline.

Summary

Most GMR problems don't come from the system itself, but from inconsistent data, wrong references, and the assumption that one number takes care of everything. If you want to check your documents before the port, or unblock a movement after an error, get in touch with us.

Official sources

• GOV.UK: Create a goods movement reference
• GOV.UK: Goods Vehicle Movement Service
• GOV.UK: Travelling under the Common Transit Convention using GVMS
• GOV.UK: GVMS service availability and issues

Frequently asked questions