T2S and CBF Releases in June 2023 – information on the deployment activities


Note: This announcement, originally published on 28 April 2023, has been updated following the publication of the T2S Playbook for the release weekend in June. An Indicative Timeline has been attached. Changes have been highlighted.

Following Announcement D23015, Clearstream Banking AG, Frankfurt1 informs clients about the TARGET2-Securities (T2S) Release in June 2023 (T2S R2023.JUN) that will be deployed on 

the weekend 10 and 11 June 2023
for business day, Monday, 12 June 2023

This Announcement shows the intended timeline and modifications in the T2S Operational Day between Friday, 9, and Monday, 12 June 2023, for the deployment of T2S Release in June 2023.

T2S Change Requests and T2S Problem Tickets

The lists of T2S Change Requests and T2S Problem Tickets (PBIs) attached to Announcement D23015 describe the scope of T2S Release in June 2023. 

Please note that only Problem Tickets are listed that might have impact on CBF clients acting in ICP and / or DCP mode. Four PBIs, that can also affect CBF clients, have been authorised for implementation with T2S Release in June 2023. 

Impacts on the CBF Business Day for the Deployment Weekend

Due to the "T2S Release Weekend Schedule" the timeline of the operational day and respective reporting during the T2S deployment weekend will be changed.

The preliminary "T2S Deployment Playbook", which defines the timeline for the implementation of the June release, is planned to be published by the European Central Bank in the week beginning 15 May 2023.  CBF will analyse the playbook and present the usual timeline overview to CBF clients on Monday before the release weekend (5 June 2023) along with an update to this Announcement.

Based on the currently available information, the following assumptions can be made:

  • Clients acting in ICP mode and using the CBF connectivity channels via SWIFT, MQ, File Transfer (FT) or ClearstreamXact need to consider that any instruction transmitted between Friday, 9 June 2023 at 20:00, and the finalisation of the Clearstream Banking implementation phase on Sunday, 11 June 2023 around 06:00, will be queued in the connectivity layer. All instructions received on Friday, 9 June 2023 by 19:45 that could not be processed, as well as queued instructions, will be processed after the deployment with the enhanced functionality. During the implementation weekend, only clients transmitting instructions via SWIFT to CBF will receive an acknowledgement upon receipt of the instruction based on their existing message subscription.
  • The opening hours of the Clearstream Online functionalities will be modified. The CASCADE HOST / PC frontend and Xact Web Portal will be available until Friday, 9 June 2023 at 20:00. After this, clients are requested not to enter, modify or cancel instructions. Over the course of Sunday, 11 June 2023, the systems will probably be re-opened between 06:30 to 11:00.
  • Clients acting in ICP mode and using an automated connectivity channel (SWIFT, MQ or File Transfer (FT)) to receive the CBF settlement reporting are requested to check the modified reporting times, where applicable. The CBF business day 9 June 2023 is planned to be closed at 19:30. Afterwards, the End of Day (EoD) reporting will be prepared and sent. CBF will provide the files according to the existing message subscription. Depending on the T2S Release in June 2023 timeline, files might be empty and will be transmitted only if the related messages have been subscribed for. In addition, the client's technical infrastructure should accept and store the provided files. Otherwise, the information / data will be lost. CBF recommends accepting files at any time during the T2S Release Weekend.
  • On Friday evening, 9 June 2023, T2S will presumably close the online functionality (T2S GUI, U2A) and the “Straight-Through Processing” channels (STP, A2A). On Sunday morning, 11 June 2023, 11:00, T2S is expected to start its maintenance window. Incoming instructions that will reach T2S during the deployment phase or maintenance window are queued. After the reopening of T2S at around 21:00, once the A2A channel and the T2S GUI will be available, these instructions will be processed in line with the T2S Operational Day.
  • Clients acting in DCP mode and using the “YCON” procedure to receive real-time settlement reporting via CBF need to consider that these messages will be transmitted on Sunday, 11 June 2023, 06:00, after CBF has started to provide the settlement results in ICP mode.
  • For the processing via KADI (CBF in its role as Issuer CSD) and Custody (OneClearstream markets), the following processing applies: Settlement instructions resulting from corporate actions processing will be created on Friday, 9 June 2023, in line with the regular business day and presented to T2S before the system will be closed for the deployment activities. On this processing day, clients will receive Corporate Actions messages (MT564, MT568) only from 23:00, deviating from the regular transmission time (that is, 19:30). Additionally, the transmission times of Corporate Action Confirmations (MT566) will be modified. The reporting, which is generated via Custody and KADI can be provided on Sunday, 11 June 2023, after 06:00 until the maintenance windows will start (at around 11:00).
  • In general, the processing at Clearstream Banking S.A., Luxembourg (CBL) is not impacted by the T2S Release Weekend procedure. The procedures in CBL regarding the settlement of DvP instructions in foreign currencies, stock exchange trades in non-collective safe custody (NCSC) as well as for the markets included in the Local Market Partner (LMP) concept will continue to run in the existing business as usual mode. However, the securities settlement of instructions which involve CBF accounts, and especially the settlement of instructions against a foreign currency, will be delayed. The cash management at CBL will be conducted according to the CBL timeline and the cash settlement result will be presented to CBF. CBF will queue these results. The settlement of the securities leg will be possible once CBF transmits the release instruction for the “CoSD Hold” to T2S. Therefore, the reporting of the cash settlement and securities settlement will be provided at different times.
  • CBF’s processing with the T2S Out-CSDs DTCC and SIX SIS will be delayed as well. Nevertheless, client settlement instructions will be forwarded to these CSDs in accordance with the market deadlines. Settlement results and feedback for pending instructions from these CSDs will be transmitted to T2S once CBF releases the queued instructions for the T2S Real-time Settlement (RTS) cycle scheduled for Sunday, 11 June 2023.

CBF client communication on the Deployment Weekend

During the T2S deployment weekend, “Operational News” will be published on the Clearstream website only if the implementation activities will be so late that CBF clients will be impacted by this delay. Clients can set up the subscription to "Operational News" and their "Alerts" in the MyClearstream section under Subscriptions respectively under Real-time alerts. Additionally, CBF recommends the setup of a subscription to TARGET2-Securities alerts by Friday, 9 June 2023, at the latest.

On Friday, 9 June 2023, at 20:30, T2S will probably greenlight the implementation of the release software. After that, clients shall monitor ECB’s website where T2S regularly reports the latest deployment and operational status.

CBF indicative timeline for the Deployment Weekend in June 2023

The attached timeline indicates the changes in the CBF operational schedule during the T2S Release Deployment Weekend.

The timeline created by CBF is based on the latest version of the T2S Playbook for the deployment weekend provided mid-May 2023. The plan covers the period from Friday, 9 June 2023, 17:45, to Monday, 12 June 2023, 06:00. Events and processes before and after this specific period can be considered as unchanged. The changes are shown in the “Revision” column as follows:


For further information, clients may contact Clearstream Banking Client Services or their Relationship Officer. Particular questions related to this Announcement 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.