Multiple error messages in logs after enabling snapshot isolation level in MSSQL database

To prevent multiple deadlocks on our database (MSSQL Server) we switch isolation level to snapshot isolation. And now we are getting following multiple messages in a log-file:

2008-09-10 09:48:10,221 ERROR [TP-Processor16] [atlassian.xwork.interceptors.XWorkTransactionInterceptor] onThrowable Invoking rollback for transaction on action '/pages/viewpage.action (ViewPageAction.execute())' due to throwable: org.springframework.jdbc.BadSqlGrammarException: Hibernate operation: could not update: [bucket.user.propertyset.BucketPropertySetItem#bucket.user.propertyset.BucketPropertySetItem@ccf6bf53]; bad SQL grammar []; nested exception is java.sql.SQLException: Snapshot isolation transaction aborted due to update conflict. You cannot use snapshot isolation to access table 'dbo.OS_PROPERTYENTRY' directly or indirectly in database 'Confluence_2_9' to update, delete, or insert the row that has been modified or deleted by another transaction. Retry the transaction or change the isolation level for the update/delete statement.
– url: /wiki/display/Connectivity/Home+of+Connectivity+product | userName: evstidm
org.springframework.jdbc.BadSqlGrammarException: Hibernate operation: could not update: [bucket.user.propertyset.BucketPropertySetItem#bucket.user.propertyset.BucketPropertySetItem@ccf6bf53]; bad SQL grammar []; nested exception is java.sql.SQLException: Snapshot isolation transaction aborted due to update conflict. You cannot use snapshot isolation to access table 'dbo.OS_PROPERTYENTRY' directly or indirectly in database 'Confluence_2_9' to update, delete, or insert the row that has been modified or deleted by another transaction. Retry the transaction or change the isolation level for the update/delete statement.
Caused by: java.sql.SQLException: Snapshot isolation transaction aborted due to update conflict. You cannot use snapshot isolation to access table 'dbo.OS_PROPERTYENTRY' directly or indirectly in database 'Confluence_2_9' to update, delete, or insert the row that has been modified or deleted by another transaction. Retry the transaction or change the isolation level for the update/delete statement.
at net.sourceforge.jtds.jdbc.SQLDiagnostic.addDiagnostic(SQLDiagnostic.java:368)
at net.sourceforge.jtds.jdbc.TdsCore.tdsErrorToken(TdsCore.java:2816)
at net.sourceforge.jtds.jdbc.TdsCore.nextToken(TdsCore.java:2254)
at net.sourceforge.jtds.jdbc.TdsCore.getMoreResults(TdsCore.java:631)
at net.sourceforge.jtds.jdbc.JtdsStatement.processResults(JtdsStatement.java:584)
at net.sourceforge.jtds.jdbc.JtdsStatement.executeSQL(JtdsStatement.java:546)
at net.sourceforge.jtds.jdbc.JtdsPreparedStatement.executeUpdate(JtdsPreparedStatement.java:505)
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeUpdate(NewProxyPreparedStatement.java:105)
at net.sf.hibernate.impl.NonBatchingBatcher.addToBatch(NonBatchingBatcher.java:22)