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MQ_ERROR_MESSAGE_LOCKED_UNDER_TRANSACTION
Retry and cleanup
Find the owning transaction and wait/recover it; duplicate consumers cannot force the lock away.
Avoiding a false diagnosis
Do not convert the operation to a nontransactional send merely to suppress the HRESULT; that changes delivery and atomicity guarantees. Code-specific condition: message is reserved by an unresolved transaction.
Example
An order processor using msmq and sql encounters it. It correlates the MSMQ call with the DTC transaction ID and final outcome before replaying business work.
References
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