This occurs because VDS entries are meant only for vehicles and not for trailers independently. Key points:

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Check Entry Type:
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Ensure the VDS record is being entered against a vehicle, not a trailer.
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Correct VDS Mapping:
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VDS data for trailers should be linked through their associated vehicle, not as a standalone trailer entry.
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Verify Retrieval:
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After entering the VDS correctly against the vehicle, the record will appear during retrieval.
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By ensuring VDS entries are made against vehicles only, the system will correctly display records on retrieval.