# Class 40 — Transaction Rollback

> Members and evidence boundaries for PostgreSQL SQLSTATE class 40.
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# Class 40 — Transaction Rollback

## Shared meaning {#meaning}

The first two characters `40` identify `Transaction Rollback`. The transaction was rolled back because it could not safely continue. A class gives a directory-level family; each member still needs its own message, transaction aftermath, and response evidence.

## Members {#members}

The locked catalogue contains 5 members in this class:

[`40000`](../../40000/), [`40001`](../../40001/), [`40002`](../../40002/), [`40003`](../../40003/), [`40P01`](../../40p01/)

## Version boundary {#versions}

Member links lead to their own versioned facts; consult the version pages and source evidence for exact presence and change boundaries.

## Sources {#sources}

Members are generated from `data/classes.json` and the locked SQLSTATE directory.