Commented Issue: Confusing "Sequence" exception when issuing migration commands [569]

When issuing migration commands from the package manager console (add-migration, update-database), I receive the output appended below. From the stack trace, I'd guess there's an issue with my model, but it more or less leaves me at a loss. I'm using VS2010 SP1 with EF5(4.4) and Nuget 2.0.31002.9028. I'd be happy to provide any additional information that would be helpful.

PM> add-migration
cmdlet Add-Migration at command pipeline position 1
Supply values for the following parameters:
Name: test
System.InvalidOperationException: Sequence contains more than one matching element
at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source, Func`2 predicate)
at System.Data.Entity.ModelConfiguration.Configuration.Mapping.ForeignKeyPrimitiveOperations.SetAllDependentColumns(DbForeignKeyConstraintMetadata fk, IEnumerable`1 sourceColumns, IEnumerable`1 destinationColumns)
at System.Data.Entity.ModelConfiguration.Configuration.Mapping.ForeignKeyPrimitiveOperations.CopyForeignKeyConstraint(DbDatabaseMetadata database, DbTableMetadata fromTable, DbTableMetadata toTable, DbForeignKeyConstraintMetadata fk)
at System.Data.Entity.ModelConfiguration.Configuration.Mapping.ForeignKeyPrimitiveOperations.<>c__DisplayClass32.<CopyAllForeignKeyConstraintsForColumn>b__31(DbForeignKeyConstraintMetadata fk)
at System.Data.Entity.ModelConfiguration.Utilities.IEnumerableExtensions.Each[T](IEnumerable`1 ts, Action`1 action)
at System.Data.Entity.ModelConfiguration.Configuration.Mapping.ForeignKeyPrimitiveOperations.CopyAllForeignKeyConstraintsForColumn(DbDatabaseMetadata database, DbTableMetadata fromTable, DbTableMetadata toTable, DbTableColumnMetadata column)
at System.Data.Entity.ModelConfiguration.Configuration.Mapping.EntityMappingOperations.UpdatePropertyMapping(DbDatabaseMetadata database, DbEdmPropertyMapping propertyMapping, DbTableMetadata fromTable, DbTableMetadata toTable, Boolean useExisting)
at System.Data.Entity.ModelConfiguration.Configuration.Mapping.EntityMappingOperations.<>c__DisplayClass5.<UpdatePropertyMappings>b__3(DbEdmPropertyMapping pm)
at System.Data.Entity.ModelConfiguration.Utilities.IEnumerableExtensions.Each[T](IEnumerable`1 ts, Action`1 action)
at System.Data.Entity.ModelConfiguration.Configuration.Mapping.EntityMappingOperations.UpdatePropertyMappings(DbDatabaseMetadata database, EdmEntityType entityType, DbTableMetadata fromTable, DbEntityTypeMappingFragment fragment, Boolean useExisting)
at System.Data.Entity.ModelConfiguration.Configuration.Mapping.EntityMappingConfiguration.Configure(DbDatabaseMapping databaseMapping, DbProviderManifest providerManifest, EdmEntityType entityType, DbEntityTypeMapping& entityTypeMapping, Boolean isMappingAnyInheritedProperty, Int32 configurationIndex, Int32 configurationCount)
at System.Data.Entity.ModelConfiguration.Configuration.Types.EntityTypeConfiguration.ConfigureTablesAndConditions(DbEntityTypeMapping entityTypeMapping, DbDatabaseMapping databaseMapping, DbProviderManifest providerManifest)
at System.Data.Entity.ModelConfiguration.Configuration.ModelConfiguration.ConfigureEntityTypes(DbDatabaseMapping databaseMapping, DbProviderManifest providerManifest)
at System.Data.Entity.ModelConfiguration.Configuration.ModelConfiguration.Configure(DbDatabaseMapping databaseMapping, DbProviderManifest providerManifest)
at System.Data.Entity.DbModelBuilder.Build(DbProviderManifest providerManifest, DbProviderInfo providerInfo)
at System.Data.Entity.DbModelBuilder.Build(DbConnection providerConnection)
at System.Data.Entity.Internal.LazyInternalContext.CreateModel(LazyInternalContext internalContext)
at System.Data.Entity.Internal.RetryLazy`2.GetValue(TInput input)
at System.Data.Entity.Internal.LazyInternalContext.InitializeContext()
at System.Data.Entity.Internal.LazyInternalContext.get_CodeFirstModel()
at System.Data.Entity.Infrastructure.EdmxWriter.WriteEdmx(DbContext context, XmlWriter writer)
at System.Data.Entity.Migrations.Extensions.DbContextExtensions.<>c__DisplayClass1.<GetModel>b__0(XmlWriter w)
at System.Data.Entity.Migrations.Extensions.DbContextExtensions.GetModel(Action`1 writeXml)
at System.Data.Entity.Migrations.Extensions.DbContextExtensions.GetModel(DbContext context)
at System.Data.Entity.Migrations.DbMigrator..ctor(DbMigrationsConfiguration configuration, DbContext usersContext)
at System.Data.Entity.Migrations.DbMigrator..ctor(DbMigrationsConfiguration configuration)
at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.GetMigrator()
at System.Data.Entity.Migrations.Design.ToolingFacade.GetPendingMigrationsRunner.RunCore()
at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.Run()
Sequence contains more than one matching element
Comments: This error is being generated while building the code first model. Would you be able to provide an example of the model (context and domain classes) that cause this issue?