# Commission Implementing Decision (EU) 2019/2151 of 13 December 2019 establishing the work programme relating to the development and deployment of the electronic systems provided for in the Union Customs Code, Division 4: The work programme establishes the following ‘dates of deployment’ for the trans-European and national systems:

Extent: E+W+S+N.I.

(a) the start date of the deployment window for the electronic systems, to be understood to mean the earliest date on which the electronic system becomes operational;
(b) the end date of the deployment window for the electronic systems, to be understood to mean:
the last date by which the systems need to be operational in all Member States and used by all economic operators; and
the end date of the validity of the transitional measures.
For the purposes of point (b), the date shall be the same as the start date if no actual window is envisaged for migration or deployment.

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Source: https://www.legislation.gov.uk/eudn/2019/2151/annex/division/I/division/4 (the official version)
Page: https://openlegislation.uk/eu-decision-2019-2151/annex/division-I/division-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.