CDS 3.9.0 Update Including Planned Downtime

BY:

Niamh O'Connor
13 January 2023

SHARE:

The major CDS 3.9.0 release will take place between 21.30 on Saturday 14 January and 04.00 on Sunday 15 January.

The major CDS 3.9.0 release will take place between 21.30 on Saturday 14 January and 04.00 on Sunday 15 January. During this period of planned downtime, you will be unable to use CDS and we would urge you to avoid making declarations if possible. during this time.

 

The related Trader Dress Rehearsal (TDR) release will take place between 09:00 on Tuesday 17 January and 09:00 on Thursday 19 January. During this period of planned downtime, you will be unable to use TDR. 


CDS 3.9.0

HMRC has advised that, from Sunday 15 January 2023, a validation rule is being added to CDS which means that a trader who completes their own customs declaration (self-representation), rather than using a Customs Broker, will need to make sure that the following Data Elements are completed in order to avoid the declaration being rejected.


Import Declarations

Where the Representative Status code in Data Element 3/21 is not declared (left blank) then Data Element 2/2 must include Additional Information (AI) Statement code 00500 with Statement text "Importer"


Export Declarations

Where the Representative Status code in Data Element 3/21 is not declared (left blank) then Data Element 2/2 must include Additional Information (AI) Statement code 00400 with Statement text "Exporter"

OneCall™ Email assistance as and when required; A one-call solution for all your import, export and customs enquiries. Export help. Import help. Customs help.

Stay informed about customs and international trade matters by subscribing to our OneCall™ service. This comprehensive offering includes a dedicated email helpline for support, timely practical updates direct to your inbox (Did You Know?), monthly UK Customs & Trade Briefings and access to an interactive members' area with an exclusive community for our subscribers.

Subscribe Today ➝

International Trade Updates & Spotlight Newsletter

Subscribe to our free information emails covering international trade topics...

Subscribe to our newsletter ➝

MORE INDUSTRY INSIGHTS...

Why Export? A Beginner’s Guide to Exporting from the UK

by Tim Hiscock • 9 September 2025
For many UK businesses, the idea of exporting can feel like a big leap. Selling your products or services overseas is not only about finding new customers, but also about opening your business up to fresh opportunities, new challenges, and long-term growth. 

What is an Import Entry?

by Laura Jones • 8 September 2025
If you are looking to start importing goods into the UK, it is essential to have a thorough understanding of the requirements and responsibilities associated with the process. One of the key elements is correctly declaring the goods coming into the UK, which is done by completing an Import entry .

UK Customs Jargon Explained: 15 Terms You Need to Know

by Niamh O'Connor • 4 September 2025
Getting into import and export can feel like plunging into a foreign country—full of unexplained shorthand and puzzling abbreviations. No one wants to look lost in conversation or feel overwhelmed when filling out a Customs form. That’s precisely why mastering Customs jargon is a smart starting point—so you can work, c
Show More