One of our developers had this when updating a table in EM

The only thing I could find in BOL relating to this was...

quote:

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The client cannot send any other Transact-SQL statements on that connection until the application has either processed all the rows returned by SQL Server or sent SQL Server a request to cancel the rest of the results. No updates can be done on the connection until all the results have been processed; the result sets are read-only.

Note Firehose cursor is an obsolete term for default result sets.

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