Luxoft · iatsuta · Jun 4, 2026 · Jun 4, 2026
diff --git a/...eration/Framework.CodeGeneration.ProjectionGenerator/FileFactory/ProjectionFileFactory.cs b/...eration/Framework.CodeGeneration.ProjectionGenerator/FileFactory/ProjectionFileFactory.cs
diff --git a/src/Framework.Core/PropertyPath/PropertyPath.cs b/src/Framework.Core/PropertyPath/PropertyPath.cs
@@ -71,7 +71,8 @@ public PropertyPath Tail
 
     public static PropertyPath operator +(PropertyPath path, PropertyInfo propertyInfo) => path.Concat([propertyInfo]).ToPropertyPath();
 
-    public static bool operator ==(PropertyPath path1, PropertyPath path2) => ReferenceEquals(path1, path2) || (!ReferenceEquals(path1, null) && path1.Equals(path2));
+    public static bool operator ==(PropertyPath path1, PropertyPath path2) =>
+        ReferenceEquals(path1, path2) || (!ReferenceEquals(path1, null) && path1.Equals(path2));
 
     public static bool operator !=(PropertyPath path1, PropertyPath path2) => !(path1 == path2);
 
@@ -86,6 +87,6 @@ private static IEnumerable<PropertyInfo> GetProperties(Type sourceType, IEnumera
             {
                 var currentType = prevProperty == null ? sourceType : prevProperty.PropertyType.GetCollectionElementTypeOrSelf();
 
-                return currentType.GetRequiredProperty(propertyName, BindingFlags.Public | BindingFlags.Instance);
+                return currentType.GetRequiredProperty(propertyName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
             }).Skip(1).Select(v => v!);
 }
diff --git a/...ection/Framework.Projection.Runtime/Lambda/ProjectionBuilder/ProjectionPropertyBuilder.cs b/...ection/Framework.Projection.Runtime/Lambda/ProjectionBuilder/ProjectionPropertyBuilder.cs
@@ -50,7 +50,7 @@ public ProjectionPropertyBuilder(ProjectionLambdaEnvironment environment, Lambda
 
     public bool IsCollection => this.CollectionType != null;
 
-    public bool IsNullable { get; }
+    public bool IsNullable { get; set; }
 
     public Type ElementType { get; }
 

diff --git a/src/Projection/Framework.Projection.Runtime/Lambda/ProjectionLambdaEnvironment.cs b/src/Projection/Framework.Projection.Runtime/Lambda/ProjectionLambdaEnvironment.cs
@@ -42,14 +42,15 @@ private ITypeResolver<IProjection> CreateProjectionTypeResolver(IProjectionSourc
 
         this.projections =
         [
-            ..projectionSource.Pipe(v => new LinkAllProjectionSource(v))
-                              .Pipe(v => new ExpandPathProjectionSource(this, v))
-                              .Pipe(v => new VerifyUniqueProjectionSource(v))
-                              .Pipe(v => this.UseDependencySecurity ? (IProjectionSource)v : new CreateSecurityNodesProjectionSource(this, v))
-                              .Pipe(v => new CreateAutoNodesProjectionSource(this, v))
-                              .Pipe(v => new InjectMissedParentsProjectionSource(this, v))
-                              .Pipe(v => new InjectAttributesProjectionSource(this, v))
-                              .GetProjections()
+            ..projectionSource
+              .Pipe(v => new LinkAllProjectionSource(v))
+              .Pipe(v => new ExpandPathProjectionSource(this, v))
+              .Pipe(v => new VerifyUniqueProjectionSource(v))
+              .Pipe(v => this.UseDependencySecurity ? (IProjectionSource)v : new CreateSecurityNodesProjectionSource(this, v))
+              .Pipe(v => new CreateAutoNodesProjectionSource(this, v))
+              .Pipe(v => new InjectMissedParentsProjectionSource(this, v))
+              .Pipe(v => new InjectAttributesProjectionSource(this, v))
+              .GetProjections()
         ];
 
         return TypeResolverHelper.Create(this.projections.ToDictionary(projection => projection, this.ProjectionTypeResolver.Resolve));
@@ -109,6 +110,11 @@ internal Type BuildPropertyType(TypeReferenceBase typeReferenceBase, GeneratedTy
         if (generatedProjection == null) throw new ArgumentNullException(nameof(generatedProjection));
         if (propertyName == null) throw new ArgumentNullException(nameof(propertyName));
 
+        if (propertyName == "BuPeriod")
+        {
+
+        }
+
         try
         {
             return this.BuildPropertyType(typeReferenceBase);

diff --git a/...ection/Framework.Projection.Runtime/Lambda/ProjectionSource/ExpandPathProjectionSource.cs b/...ection/Framework.Projection.Runtime/Lambda/ProjectionSource/ExpandPathProjectionSource.cs
@@ -1,5 +1,6 @@
 using Anch.Core;
 
+using Framework.Core;
 using Framework.Database.Mapping.Extensions;
 using Framework.Projection.Lambda.Extensions;
 
@@ -15,7 +16,13 @@ public IEnumerable<IProjection> GetProjections()
         {
             foreach (var propertyBuilder in projectionBuilder.Properties)
             {
-                propertyBuilder.Path = environment.PropertyPathService.WithExpand(propertyBuilder.Path);
+                var newPath = environment.PropertyPathService.WithExpand(propertyBuilder.Path);
+
+                if (newPath != propertyBuilder.Path)
+                {
+                    propertyBuilder.Path = newPath;
+                    propertyBuilder.IsNullable = propertyBuilder.Expression.ReturnType.IsValueType && propertyBuilder.Path.HasReferenceResult();
+                }
 
                 propertyBuilder.Path.Where(prop => !prop.IsPersistent()).Foreach(prop => throw new Exception($"Projection property \"{prop.Name}\" of path \"{propertyBuilder.Path}\" must be persistent"));
             }

diff --git a/src/_SampleSystem/SampleSystem.Domain.Projections/SampleSystem.Generated.cs b/src/_SampleSystem/SampleSystem.Domain.Projections/SampleSystem.Generated.cs
@@ -278,6 +278,67 @@ public virtual System.DateTime PeriodStartDateXXX
         }
     }
 
+    [Framework.BLL.Domain.Attributes.DependencySecurityAttribute(typeof(SampleSystem.Domain.Employee.Employee))]
+    [Framework.Database.Mapping.TableAttribute(Name="Employee")]
+    [Framework.Projection.ProjectionAttribute(typeof(SampleSystem.Domain.Employee.Employee), Framework.Projection.ProjectionRole.Default)]
+    public partial class EmployeeWithBuPeriod : SampleSystem.Domain.PersistentDomainObjectBase
+    {
+
+        private SampleSystem.Domain.Projections.EmployeeWithBuPeriod_AutoProp_CoreBusinessUnit coreBusinessUnit_Auto;
+
+        protected EmployeeWithBuPeriod()
+        {
+        }
+
+        [Framework.Projection.ProjectionPropertyAttribute(Framework.Projection.ProjectionPropertyRole.Default)]
+        [Framework.BLL.Domain.Persistent.Attributes.ExpandPathAttribute("CoreBusinessUnit_Auto.Period_Last_BuPeriod")]
+        [Framework.Database.Mapping.MappingPropertyAttribute(CanInsert=false, CanUpdate=false)]
+        public virtual Framework.Core.Period? BuPeriod
+        {
+            get
+            {
+                return this.CoreBusinessUnit_Auto?.Period_Last_BuPeriod;
+            }
+        }
+
+        [Framework.BLL.Domain.Serialization.CustomSerializationAttribute(Framework.BLL.Domain.Serialization.CustomSerializationMode.Ignore)]
+        [Framework.Projection.ProjectionPropertyAttribute(Framework.Projection.ProjectionPropertyRole.AutoNode)]
+        [Framework.Database.Mapping.MappingAttribute(ColumnName="coreBusinessUnitId")]
+        [Framework.Database.Mapping.MappingPropertyAttribute(CanInsert=false, CanUpdate=false)]
+        public virtual SampleSystem.Domain.Projections.EmployeeWithBuPeriod_AutoProp_CoreBusinessUnit CoreBusinessUnit_Auto
+        {
+            get
+            {
+                return this.coreBusinessUnit_Auto;
+            }
+        }
+    }
+
+    [Framework.BLL.Domain.Attributes.DependencySecurityAttribute(typeof(SampleSystem.Domain.BU.BusinessUnit))]
+    [Framework.Database.Mapping.TableAttribute(Name="BusinessUnit")]
+    [Framework.Projection.ProjectionAttribute(typeof(SampleSystem.Domain.BU.BusinessUnit), Framework.Projection.ProjectionRole.AutoNode)]
+    public partial class EmployeeWithBuPeriod_AutoProp_CoreBusinessUnit : SampleSystem.Domain.PersistentDomainObjectBase
+    {
+
+        private Framework.Core.Period period_Last_BuPeriod;
+
+        protected EmployeeWithBuPeriod_AutoProp_CoreBusinessUnit()
+        {
+        }
+
+        [Framework.BLL.Domain.Serialization.CustomSerializationAttribute(Framework.BLL.Domain.Serialization.CustomSerializationMode.Ignore)]
+        [Framework.Projection.ProjectionPropertyAttribute(Framework.Projection.ProjectionPropertyRole.LastAutoNode)]
+        [Framework.Database.Mapping.MappingAttribute(ColumnName="period")]
+        [Framework.Database.Mapping.MappingPropertyAttribute(CanInsert=false, CanUpdate=false)]
+        public virtual Framework.Core.Period Period_Last_BuPeriod
+        {
+            get
+            {
+                return this.period_Last_BuPeriod;
+            }
+        }
+    }
+
     [Framework.BLL.Domain.Attributes.DependencySecurityAttribute(typeof(SampleSystem.Domain.BU.BusinessUnit))]
     [Framework.Database.Mapping.TableAttribute(Name="BusinessUnit")]
     [Framework.Projection.ProjectionAttribute(typeof(SampleSystem.Domain.BU.BusinessUnit), Framework.Projection.ProjectionRole.Default)]
@@ -516,6 +577,17 @@ public virtual SampleSystem.Domain.Projections.TestBusinessUnit_AutoProp_Parent
             }
         }
 
+        [Framework.Projection.ProjectionPropertyAttribute(Framework.Projection.ProjectionPropertyRole.Default)]
+        [Framework.BLL.Domain.Persistent.Attributes.ExpandPathAttribute("Parent_Auto.Period_Last_ParentPeriod")]
+        [Framework.Database.Mapping.MappingPropertyAttribute(CanInsert=false, CanUpdate=false)]
+        public virtual Framework.Core.Period? ParentPeriod
+        {
+            get
+            {
+                return this.Parent_Auto?.Period_Last_ParentPeriod;
+            }
+        }
+
         [Framework.Projection.ProjectionPropertyAttribute(Framework.Projection.ProjectionPropertyRole.Default)]
         [Framework.BLL.Domain.Persistent.Attributes.ExpandPathAttribute("Parent_Auto.PeriodStartDate_Last_ParentPeriodStartDate")]
         [Framework.Database.Mapping.MappingPropertyAttribute(CanInsert=false, CanUpdate=false)]
@@ -545,12 +617,26 @@ public virtual System.DateTime? PeriodEndDate
     public partial class TestBusinessUnit_AutoProp_Parent : SampleSystem.Domain.PersistentDomainObjectBase
     {
 
+        private Framework.Core.Period period_Last_ParentPeriod;
+
         private System.DateTime periodStartDate_Last_ParentPeriodStartDate;
 
         protected TestBusinessUnit_AutoProp_Parent()
         {
         }
 
+        [Framework.BLL.Domain.Serialization.CustomSerializationAttribute(Framework.BLL.Domain.Serialization.CustomSerializationMode.Ignore)]
+        [Framework.Projection.ProjectionPropertyAttribute(Framework.Projection.ProjectionPropertyRole.LastAutoNode)]
+        [Framework.Database.Mapping.MappingAttribute(ColumnName="period")]
+        [Framework.Database.Mapping.MappingPropertyAttribute(CanInsert=false, CanUpdate=false)]
+        public virtual Framework.Core.Period Period_Last_ParentPeriod
+        {
+            get
+            {
+                return this.period_Last_ParentPeriod;
+            }
+        }
+
         [Framework.BLL.Domain.Serialization.CustomSerializationAttribute(Framework.BLL.Domain.Serialization.CustomSerializationMode.Ignore)]
         [Framework.Projection.ProjectionPropertyAttribute(Framework.Projection.ProjectionPropertyRole.LastAutoNode)]
         [Framework.Database.Mapping.MappingAttribute(ColumnName="periodStartDate")]

diff --git a/src/_SampleSystem/SampleSystem.Domain/Employee/Employee.cs b/src/_SampleSystem/SampleSystem.Domain/Employee/Employee.cs
@@ -261,6 +261,9 @@ public virtual DateTime? HireDate
     ////    set { this.address = value; }
     ////}
 
+    [ExpandPath("CoreBusinessUnit.Period")]
+    public virtual Period BuPeriod => this.CoreBusinessUnit.Maybe(v => v.Period);
+
     [ExpandPath("HRDepartment.Location")]
     public virtual Location Location => this.HRDepartment?.Location;
 

diff --git a/...System.Generated.DAL.NHibernate/Mapping/Generated.SampleSystem.Domain.Projections.hbm.xml b/...System.Generated.DAL.NHibernate/Mapping/Generated.SampleSystem.Domain.Projections.hbm.xml
@@ -44,6 +44,21 @@
       <property name="PeriodStartDateXXX" column="periodStartDate" type="timestamp" insert="false" update="false" access="field.camelcase" />
     </join>
   </class>
+  <class name="SampleSystem.Domain.Projections.EmployeeWithBuPeriod" table="Employee">
+    <id name="Id" column="id" type="Guid" access="field.camelcase">
+      <generator class="guid.comb" />
+    </id>
+    <many-to-one name="CoreBusinessUnit_Auto" column="coreBusinessUnitId" class="SampleSystem.Domain.Projections.EmployeeWithBuPeriod_AutoProp_CoreBusinessUnit" access="field.camelcase" insert="false" update="false" />
+  </class>
+  <class name="SampleSystem.Domain.Projections.EmployeeWithBuPeriod_AutoProp_CoreBusinessUnit" table="BusinessUnit">
+    <id name="Id" column="id" type="Guid" access="field.camelcase">
+      <generator class="guid.comb" />
+    </id>
+    <component name="Period_Last_BuPeriod" class="Framework.Core.Period, Framework.Core" access="field.camelcase">
+      <property name="EndDate" column="periodendDate" access="field.camelcase" type="timestamp" />
+      <property name="StartDate" column="periodstartDate" access="field.camelcase" type="timestamp" />
+    </component>
+  </class>
   <class name="SampleSystem.Domain.Projections.HerBusinessUnit" table="BusinessUnit">
     <id name="Id" column="id" type="Guid" access="field.camelcase">
       <generator class="guid.comb" />
@@ -76,6 +91,10 @@
       <generator class="guid.comb" />
     </id>
     <property name="PeriodStartDate_Last_ParentPeriodStartDate" column="periodStartDate" type="timestamp" insert="false" update="false" access="field.camelcase" />
+    <component name="Period_Last_ParentPeriod" class="Framework.Core.Period, Framework.Core" access="field.camelcase">
+      <property name="EndDate" column="periodendDate" access="field.camelcase" type="timestamp" />
+      <property name="StartDate" column="periodstartDate" access="field.camelcase" type="timestamp" />
+    </component>
   </class>
   <class name="SampleSystem.Domain.Projections.TestBusinessUnitType" table="BusinessUnitType">
     <id name="Id" column="id" type="Guid" access="field.camelcase">

diff --git a/src/_SampleSystem/SampleSystem.Generated.DTO/SampleSystem.Event.Generated.cs b/src/_SampleSystem/SampleSystem.Generated.DTO/SampleSystem.Event.Generated.cs
@@ -7884,6 +7884,8 @@ public partial class EmployeeEventRichDTO
 
         private System.DateTime? _birthDate;
 
+        private Framework.Core.Period _buPeriod;
+
         private bool _canBePPM;
 
         private string _cellPhone;
@@ -8037,6 +8039,19 @@ public System.DateTime? BirthDate
             }
         }
 
+        [System.Runtime.Serialization.DataMemberAttribute()]
+        public Framework.Core.Period BuPeriod
+        {
+            get
+            {
+                return this._buPeriod;
+            }
+            set
+            {
+                this._buPeriod = value;
+            }
+        }
+
         [System.Runtime.Serialization.DataMemberAttribute()]
         public bool CanBePPM
         {
@@ -8649,6 +8664,8 @@ public partial class EmployeeEventSimpleDTO
 
         private System.DateTime? _birthDate;
 
+        private Framework.Core.Period _buPeriod;
+
         private bool _canBePPM;
 
         private string _cellPhone;
@@ -8772,6 +8789,19 @@ public System.DateTime? BirthDate
             }
         }
 
+        [System.Runtime.Serialization.DataMemberAttribute()]
+        public Framework.Core.Period BuPeriod
+        {
+            get
+            {
+                return this._buPeriod;
+            }
+            set
+            {
+                this._buPeriod = value;
+            }
+        }
+
         [System.Runtime.Serialization.DataMemberAttribute()]
         public bool CanBePPM
         {

diff --git a/src/_SampleSystem/SampleSystem.Generated.DTO/SampleSystem.Generated.cs b/src/_SampleSystem/SampleSystem.Generated.DTO/SampleSystem.Generated.cs
@@ -14165,6 +14165,8 @@ public partial class EmployeeSimpleDTO : SampleSystem.Generated.DTO.BaseAuditPer
 
         private System.DateTime? _birthDate;
 
+        private Framework.Core.Period _buPeriod = Framework.Core.Period.Eternity;
+
         private bool _canBePPM;
 
         private string _cellPhone;
@@ -14269,6 +14271,19 @@ public System.DateTime? BirthDate
             }
         }
 
+        [System.Runtime.Serialization.DataMemberAttribute()]
+        public Framework.Core.Period BuPeriod
+        {
+            get
+            {
+                return this._buPeriod;
+            }
+            set
+            {
+                this._buPeriod = value;
+            }
+        }
+
         [System.Runtime.Serialization.DataMemberAttribute()]
         public bool CanBePPM
         {

diff --git a/src/_SampleSystem/SampleSystem.Generated.DTO/SampleSystem.Helpers.Generated.cs b/src/_SampleSystem/SampleSystem.Generated.DTO/SampleSystem.Helpers.Generated.cs
@@ -1401,6 +1401,11 @@ public static SampleSystem.Generated.DTO.CustomTestObjForNestedProjectionDTO ToP
             return new SampleSystem.Generated.DTO.CustomTestObjForNestedProjectionDTO(mappingService, domainObject);
         }
 
+        public static SampleSystem.Generated.DTO.EmployeeWithBuPeriodProjectionDTO ToProjectionDTO(this SampleSystem.Domain.Projections.EmployeeWithBuPeriod domainObject, SampleSystem.Generated.DTO.ISampleSystemDTOMappingService mappingService)
+        {
+            return new SampleSystem.Generated.DTO.EmployeeWithBuPeriodProjectionDTO(mappingService, domainObject);
+        }
+
         public static SampleSystem.Generated.DTO.HerBusinessUnitProjectionDTO ToProjectionDTO(this SampleSystem.Domain.Projections.HerBusinessUnit domainObject, SampleSystem.Generated.DTO.ISampleSystemDTOMappingService mappingService)
         {
             return new SampleSystem.Generated.DTO.HerBusinessUnitProjectionDTO(mappingService, domainObject);
@@ -1506,6 +1511,11 @@ public static SampleSystem.Generated.DTO.VisualProjectProjectionDTO ToProjection
             return Framework.Core.CoreEnumerableExtensions.ToList(domainObjects, domainObject => SampleSystem.Generated.DTO.LambdaHelper.ToProjectionDTO(domainObject, mappingService));
         }
 
+        public static System.Collections.Generic.List<SampleSystem.Generated.DTO.EmployeeWithBuPeriodProjectionDTO> ToProjectionDTOList(this System.Collections.Generic.IEnumerable<SampleSystem.Domain.Projections.EmployeeWithBuPeriod> domainObjects, SampleSystem.Generated.DTO.ISampleSystemDTOMappingService mappingService)
+        {
+            return Framework.Core.CoreEnumerableExtensions.ToList(domainObjects, domainObject => SampleSystem.Generated.DTO.LambdaHelper.ToProjectionDTO(domainObject, mappingService));
+        }
+
         public static System.Collections.Generic.List<SampleSystem.Generated.DTO.HerBusinessUnitProjectionDTO> ToProjectionDTOList(this System.Collections.Generic.IEnumerable<SampleSystem.Domain.Projections.HerBusinessUnit> domainObjects, SampleSystem.Generated.DTO.ISampleSystemDTOMappingService mappingService)
         {
             return Framework.Core.CoreEnumerableExtensions.ToList(domainObjects, domainObject => SampleSystem.Generated.DTO.LambdaHelper.ToProjectionDTO(domainObject, mappingService));