The symptom
Driver at the port. GMR rejected. Loud phone call.
Step 1: Read the reference formats
Was any XI-prefixed MRN entered as a customs declaration on GVMS? That is the most common cause. XI prefix means Entry in Declarant's Records, plus the trader's EORI.
Step 2: Check trailer and vehicle registration match
Any trailer swap in the last hours? Update the GMR before boarding. Nothing can be changed after the boarding barcode is scanned.
Step 3: Reconcile manifest against consignments on the GMR
For groupage, one missing MRN blocks the whole trailer. Count them.
Step 4: Verify non-TSS consignments have safety and security data
If an MRN was added without the S&S data, GVMS accepts the reference but rejects the movement.
Step 5: Check whether upstream declarations actually exist
A GMR cannot be built without underlying MRNs. If TSS has not issued them, the reference build silently produces nothing.
A longer walkthrough of these failure modes is in this GMR troubleshooting field guide.
Step 6: Confirm inspection status after embarkation
Status changes after the ferry leaves. Missing this is how inspection requirements are missed on arrival.
Cut debugging time by connecting TSS declarations directly to GMR building. Watch a demo.
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