Hello, an InvalidOperationException with message "Sequence contains no matching element" thrown during building database:

at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source, Func`2 predicate)
at Xtensive.Orm.Upgrade.HintGenerator.MapNestedFields(StoredFieldInfo oldField, StoredFieldInfo newField)
at Xtensive.Orm.Upgrade.HintGenerator.BuildFieldMapping(IEnumerable`1 renames, IEnumerable`1 typeChanges)
at Xtensive.Orm.Upgrade.HintGenerator.GenerateHints(IEnumerable`1 upgradeHints)
at Xtensive.Orm.Upgrade.UpgradingDomainBuilder.BuildSchemaHints(StorageInfo extractedSchema, StorageInfo targetSchema)
at Xtensive.Orm.Upgrade.UpgradingDomainBuilder.<>c__DisplayClass7.<CreateBuilderConfiguration>b__3(StorageInfo extractedSchema, StorageInfo targetSchema)
at Xtensive.Orm.Building.Builders.DomainBuilder.SynchronizeSchema(SchemaUpgradeMode schemaUpgradeMode)
at Xtensive.Orm.Building.Builders.DomainBuilder.BuildDomain(DomainConfiguration configuration, DomainBuilderConfiguration builderConfiguration)
at Xtensive.Orm.Upgrade.UpgradingDomainBuilder.BuildStageDomain(UpgradeStage stage)
at Xtensive.Orm.Upgrade.UpgradingDomainBuilder.Build(DomainConfiguration configuration)
at Microtech.Andalus.Business.DomainManager.BuildNewCompany(Company company) in D:\ahmad emad andalus work\AndalusNew\Framework\trunk\Microtech.Andalus.Business\Core\DomainManager.cs:line 303
at Microtech.Andalus.Business.DomainManager.BuildCompany() in D:\ahmad emad andalus work\AndalusNew\Framework\trunk\Microtech.Andalus.Business\Core\DomainManager.cs:line 77

the significant change we made was collecting 8 fields used in a lot of tables into an Structure and use the Structure in the table instead of separated fields:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Xtensive.Orm;
using Microtech.Andalus.Business;
using Microtech.Infinity5.Model.Common;
using Microtech.Andalus.Business.BusinessUnitCore;
using Microtech.Infinity5.Model.Financial.GL;

namespace Microtech.Infinity5.Model.Operations.SC 
{

   public class GLAccountOption : Structure
   {
       [Field]
       public HierarchicalGLAccount Account { get; set; }

       [Field]
       public CostCenter CostCenter { get; set; }

       [Field]    
       public Department Department { get; set; }

       [Field]
       public Project Project { get; set; }

       [Field]
       public Location Location { get; set; }

       [Field]
       public BudgetSource BudgetSource { get; set; }

       [Field]
       public StatisticalCode StatisticalCode { get; set; }

       [Field]
       public Journal Journal { get; set; }        
   }

}

the database contains data and the following is the domain configration we are using:

<domain name="Company" upgradeMode="Perform" connectionUrl="sqlserver://sa:Thank$123@C010/CompanyDB16012012" validationMode="OnDemand">
            <sessions>
                <session name="Default" options="LegacyProfile,AllowSwitching,ReadRemovedObjects"/>
            </sessions>
            <types>
                <add assembly="Microtech.Andalus.Business" namespace="Microtech.Andalus.Mask"/>
                <add assembly="Microtech.Andalus.Globalization"/>
                <add assembly="Microtech.Infinity5.Model"/>
                <add assembly="Microtech.Andalus.Business" namespace="Microtech.Andalus.Workflow.Core"/>
            </types>
        </domain>