ERROR_TRANSACTION_MUST_WRITETHROUGH

The transaction cannot be enlisted on with the specified EnlistmentMask, because the transaction has already completed the PrePrepare phase.

Matched as: the code as given (hex)

The transaction cannot be enlisted on with the specified EnlistmentMask, because the transaction has already completed the PrePrepare phase. In order to ensure correctness, the ResourceManager must switch to a write- through mode and cease caching data within this transaction. Enlisting for only subsequent transaction phases may still succeed.

Source: System Error Codes (6000-8199) - Win32 apps · CC-BY-4.0 (MicrosoftDocs/sdk-api, repo license verified 2026-10-09) · retrieved 2026-10-09