An incorrect company number or Declaration of Works number was used. How do I request a change, and within what period?

Last verified:

If the worker registered using (a) an incorrect company number or (b) an incorrect Declaration of Works number, the employer can request a change to the registration data.

If the worker registered using (a) an incorrect company number or (b) an incorrect Declaration of Works number, the employer can request a change to the registration data. A request for changes must be submitted within 30 days of the registration concerned by contacting the NSSO through the CIaO management web service, clicking the envelope icon and completing the web form.

Content derived from www.socialsecurity.be.

Start with CIAO Connect—for free

Set up your account and discover your company’s complete situation.

  1. Create your account

    Verify your email and confirm your company details.

  2. Connect to the NSSO

    Follow the guided connection instructions and add your Declaration of Works (DDT) numbers.

  3. Discover your dashboard

    Import your data to see the complete overview of your situation and identified errors.

What is included for free?

Onboarding and access to the complete dashboard overview. Free guidance is limited to 2 person-related errors and 1 DDT-related error.

Help is always within reach

You can open the chat widget at any time during onboarding to ask for help.

Check your NSSO registrations for free

Prefer a guided introduction? Plan a demo