INCIDENT REPORT
Daily Organiser – LISS Integration
Resolved
21 July 2026
-
29 July 2026
Affected Service
Daily Organiser – LISS Integration
Incident Summary
Some schools using the LISS integration experienced an issue where the first DailyData sync following publication of a timetable did not contain the expected class data. Subsequent synchronisations operated normally.
A change designed to improve the efficiency of timetable publishing meant that some data required by LISS was no longer generated as part of the publishing process.
Under normal use, this data was subsequently generated when Daily Organiser was opened for the relevant date.
This created a specific scenario where a user could publish a timetable and then perform a LISS sync without first opening Daily Organiser. In this situation, the data required by LISS had not yet been generated and the resulting DailyData transmission could contain no class data.
Once Daily Organiser was opened, the required data was generated and subsequent LISS synchronisations contained the expected information.
What Happened
Root Cause
LISS operates as a passive integration. It reads and transmits the Daily Organiser data that is available at the time of the synchronisation; it does not itself cause missing Daily Organiser data to be generated.
The timetable publishing optimisation changed when some of this data was generated without fully accounting for this dependency. As a result, a LISS synchronisation performed immediately after timetable publication could occur before the required data had been generated.
Resolution
A fix was deployed on 29 July 2026 to ensure that the data required by LISS is generated and available following timetable publication, without requiring a user to first open Daily Organiser.
Following deployment, affected schools were able to synchronise normally.
Preventative Actions
The publishing process has been updated to ensure data required by downstream integrations is generated when required.
The publish-to-LISS workflow has also been incorporated into regression testing, including the scenario where a LISS synchronisation is performed immediately after publishing without first opening Daily Organiser.