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SQL Server error code

SQL Server error 8525

SQL Server raises error 8525 at severity 16, which marks a problem with the query or data that you can correct.

Distributed transaction completed. Either enlist this session in a new transaction or the NULL transaction.
Msg8525
Severity16
Group8000–8999

What it means

The programming model for using the Distributed Transaction Coordinator with SQL Server requires applications to explicitly enlist to and defect from a distributed transaction.

Source: Database Engine events and errors