T2S Release 6.3 – Introduction on 20 February 2023 - Update II


Note: This announcement, originally published on 26 August 2022 and enhanced on 1 December 2022, has been updated to provide customers with the latest scope elements of T2S Release 6.3. Changes have been highlighted

Clearstream Banking AG, Frankfurt1 informs customers about the intended TARGET2-Securities (T2S) Release 6.3. According to the T2S Release Concept, the resolution for T2S Problem Tickets (PBIs) could be deployed on

Saturday, 18 February 2023
for the business day Monday, 20 February 2023

T2S Release 6.3 - Scope

Based on the T2S status reporting end-December 2022, for T2S Release 6.3 24 Problem Ticket have been recommended for a delivery in production. CBF’s assessment related to these Problem Tickets (PBIs) shows that these fixes will not require any software changes in CBF. The changes will have no impact on CBF customers acting in ICP mode.

For customers acting in DCP mode, five PBIs have been identified. Four tickets have already been confirmed for implementation by the T2S Operational Managers Group (OMG). The ticket still proposed for implementation is affecting the graphical user interface (GUI). The attached list gives an overview with an indication of the delivery being planned (“scheduled”) or still waiting for the final decision regarding the implementation in February 2023 to be taken (“candidate”).

T2S Release 6.3 – Transition plan

The deployment of T2S Release 6.3 into production is planned for business day Monday, 20 February 2023. The implementation of the software will take place during the weekend’s T2S maintenance window. Meaning that currently no changes in the T2S Operational Day are expected for the end of day (EoD) procedure on Friday, 17 February 2023, or for the start of business day on Monday, 20 February 2023.

Customer simulation

The simulation activities will be conducted in a “free simulation mode”. The already established static data for CBF accounts and the related connectivity settings in the CBF customer simulation environment (IMS23) remain unchanged.

Irrespective of whether CBF has to modify its software, CBF will maintain its link to the T2S Pre-Production environment (UTEST) so that customers can test on their demand. The updated software can be validated from Monday, 23 January 2023 up to and including Wednesday, 1 February 2023. According to the latest information provided, ECB plans to install the updated software in UTEST on Friday, 20 January 2023.  On that day, the UTEST and the connected test environments will be closed due to installation activities.

Further information

For further information, customers may contact Clearstream Banking Client Services or their Relationship Officer. Particular questions related to the production launch in February 2023 will be routed to the experts of the T2S Settlement Functionality team.


1. This Announcement is published by Clearstream Banking AG (CBF), registered office at Mergenthalerallee 61, 65760 Eschborn, Germany, registered with the Commercial Register of the District Court in Frankfurt am Main, Germany, under number HRB 7500.