Assessment always failed

The discovery works well, but the assessment as second step alway failed.

The log file shows the following error message

<2014-01-27 10:13:31.97 AssessInventoryWorker@Analyzer,E> RunAssessments() - Assessment threw an exception:
   |Microsoft.AssessmentPlatform.MapException: Caught SqlException running the stored procedure [AllDevices_Assessment].[HardwareInventoryProc]. ---> System.Data.SqlClient.SqlException: Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
   |The statement has been terminated.
   |   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   |   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   |   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   |   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   |   at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
   |   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite)
   |   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite)
   |   at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean asyncWrite)
   |   at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
   |   at Microsoft.AssessmentPlatform.DataAccess.DataAccessCore.ExecuteStoredProcHelper(String storedProcName, Object[] parameters)
   |   at Microsoft.AssessmentPlatform.DataAccess.DataAccessCore.<>c__DisplayClassa.<ExecuteStoredProc>b__9()
   |   at Microsoft.AssessmentPlatform.DataAccess.DataAccessCore.DoWorkInTransaction[T](Nullable`1 isolationLevel, String onSqlExceptionMessage, TransactionWorkCallback`1 callback)
   |   --- End of inner exception stack trace ---
   |   at Microsoft.AssessmentPlatform.DataAccess.DataAccessCore.DoWorkInTransaction[T](Nullable`1 isolationLevel, String onSqlExceptionMessage, TransactionWorkCallback`1 callback)
   |   at Microsoft.AssessmentPlatform.DataAccess.DataAccessCore.ExecuteStoredProc(Nullable`1 isolationLevel, String storedProcName, Object[] parameters)
   |   at Microsoft.AssessmentPlatform.Analytics.Assessments.StoredProcAssessment.RunAssessment(ThreadSafeFlag continueProcessingFlag, SecureString connectionString)
   |   at Microsoft.AssessmentPlatform.Analytics.Analyzer.RunAssessments(IEnumerable`1 assessments)
<2014-01-27 10:13:31.97 AssessInventoryWorker@AssessInventoryWorker,I> AssessmentCompletedEventHandler: Assessment completed event.

I have no idea to fix a SQL problem in this tool.