diff --git a/packages/apiclient/src/restRequestBuilder.ts b/packages/apiclient/src/restRequestBuilder.ts
index 0e4605e8..c399620d 100644
--- a/packages/apiclient/src/restRequestBuilder.ts
+++ b/packages/apiclient/src/restRequestBuilder.ts
@@ -123,11 +123,16 @@ export class RestRequestBuilder {
     return this;
   }
 
-  getQueryString(query: any) {
-    return stringify(query, this.queryStringOptions ?? RestRequestBuilder.DefaultQueryStringOptions);
+  getQueryString(query: any, queryStringOptions?: StringifyOptions) {
+    return stringify(query, queryStringOptions ?? this.queryStringOptions ?? RestRequestBuilder.DefaultQueryStringOptions);
   }
 
-  appendQuery(url: string, query?: any) {
-    return query ? `${url}?${this.getQueryString(query)}` : url;
+  appendQuery(url: string, query?: any, queryStringOptions?: StringifyOptions) {
+    if (!query) {
+      return url;
+    }
+
+    const queryString = typeof query === "string" ? query : this.getQueryString(query, queryStringOptions);
+    return `${url}?${queryString}`;
   }
 }
diff --git a/packages/generator/src/openapi/fileGenerator.ts b/packages/generator/src/openapi/fileGenerator.ts
index 50055961..9e4c7648 100644
--- a/packages/generator/src/openapi/fileGenerator.ts
+++ b/packages/generator/src/openapi/fileGenerator.ts
@@ -29,10 +29,11 @@ export default class FileGenerator {
     for (const { type } of items) {
       if (type instanceof Enum) {
         enumWriter.write(type);
+      } else if (type instanceof InheritedEntity) {
+        const baseEntity = type.baseEntities.map(x => x.type).filter(x => x instanceof ObjectEntity)[0] as ObjectEntity;
+        objectWriter.write(type, baseEntity);
       } else if (type instanceof ObjectEntity) {
         objectWriter.write(type);
-      } else if (type instanceof InheritedEntity) {
-        this.handleInheritedEntity(objectWriter, type);
       } else if (type instanceof UnionEntity) {
         unionWriter.write(type);
       }
@@ -46,12 +47,4 @@ export default class FileGenerator {
 
     progress.stop();
   }
-
-  private handleInheritedEntity(writer: ObjectEntityWriter, source: InheritedEntity) {
-    const objects = source.baseEntities.filter(x => x.type instanceof ObjectEntity).map(x => x.type as ObjectEntity);
-
-    const properties = objects.slice(1).flatMap(x => x.properties);
-    const composedEntity = new ObjectEntity(source.name, properties);
-    writer.write(composedEntity, objects[0]);
-  }
 }
diff --git a/packages/generator/src/openapi/models/inheritedEntity.ts b/packages/generator/src/openapi/models/inheritedEntity.ts
index 8b456441..6f34ac60 100644
--- a/packages/generator/src/openapi/models/inheritedEntity.ts
+++ b/packages/generator/src/openapi/models/inheritedEntity.ts
@@ -1,8 +1,9 @@
-import NamedObject from "./namedObject";
+import EntityProperty from "./entityProperty";
+import ObjectEntity from "./objectEntity";
 import TypeReference from "./typeReference";
 
-export default class InheritedEntity extends NamedObject {
-  constructor(name: string, public baseEntities: TypeReference[]) {
-    super(name);
+export default class InheritedEntity extends ObjectEntity {
+  constructor(name: string, public baseEntities: TypeReference[], properties: EntityProperty[]) {
+    super(name, properties);
   }
 }
diff --git a/packages/generator/src/openapi/parsers/openApi2Parser.ts b/packages/generator/src/openapi/parsers/openApi2Parser.ts
index 9f75a2b1..2d84f354 100644
--- a/packages/generator/src/openapi/parsers/openApi2Parser.ts
+++ b/packages/generator/src/openapi/parsers/openApi2Parser.ts
@@ -95,17 +95,31 @@ export default class OpenApi2Parser {
 
   private parseAllOfObject(name: string, definition: OpenAPIV2.SchemaObject) {
     // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-    const innerTypes = definition.allOf!.map((x, i) =>
-      this.parseSchemaObject(`${name}Parent${i + 1}`, x as OpenAPIV2.SchemaObject | OpenAPIV2.ItemsObject)
+    const subTypes = definition.allOf!;
+
+    const plainObjects = subTypes.filter(
+      x => !isV2ReferenceObject(x) && x.type === "object" && !x.allOf && !x.oneOf
+    ) as OpenAPIV2.SchemaObject[];
+
+    const otherParents = subTypes
+      .filter(x => !plainObjects.includes(x as any))
+      .map((x, i) => this.parseSchemaObject(`${name}Parent${i + 1}`, x as OpenAPIV2.SchemaObject));
+
+    const properties = plainObjects.flatMap(x => this.extractObjectProperties(name, x));
+
+    const entity = new InheritedEntity(name, otherParents, properties);
+
+    plainObjects.forEach(object =>
+      object.required?.forEach(property => entity.addPropertyRestriction(property, Restriction.required, true))
     );
 
-    const entity = new InheritedEntity(name, innerTypes);
     return this.setTypeReference(name, entity);
   }
 
   private parseOneOfObject(name: string, definition: OpenAPIV2.SchemaObject) {
     // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-    const innerTypes = definition.oneOf!.map((x, i) =>
+    const subTypes = definition.oneOf!;
+    const innerTypes = subTypes.map((x, i) =>
       this.parseSchemaObject(`${name}Option${i + 1}`, x as OpenAPIV2.SchemaObject | OpenAPIV2.ItemsObject)
     );
 
@@ -114,9 +128,7 @@ export default class OpenApi2Parser {
   }
 
   private parseObjectWithProperties(name: string, definition: OpenAPIV2.SchemaObject) {
-    const properties = definition.properties
-      ? Object.entries(definition.properties).map(x => this.parseEntityProperty(name, x[0], x[1]))
-      : [];
+    const properties = this.extractObjectProperties(name, definition);
 
     const entity = new ObjectEntity(name, properties);
     definition.required?.forEach(property => entity.addPropertyRestriction(property, Restriction.required, true));
@@ -124,6 +136,12 @@ export default class OpenApi2Parser {
     return this.setTypeReference(name, entity);
   }
 
+  private extractObjectProperties(entityName: string, definition: OpenAPIV2.SchemaObject) {
+    return definition.properties
+      ? Object.entries(definition.properties).map(x => this.parseEntityProperty(entityName, x[0], x[1]))
+      : [];
+  }
+
   private parseEntityProperty(
     entityName: string,
     propertyName: string,
diff --git a/packages/generator/src/openapi/parsers/openApi3Parser.ts b/packages/generator/src/openapi/parsers/openApi3Parser.ts
index 26caf0d0..a611d570 100644
--- a/packages/generator/src/openapi/parsers/openApi3Parser.ts
+++ b/packages/generator/src/openapi/parsers/openApi3Parser.ts
@@ -91,24 +91,38 @@ export default class OpenApi3Parser {
 
   private parseAllOfObject(name: string, definition: OpenAPIV3.SchemaObject) {
     // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-    const innerTypes = definition.allOf!.map((x, i) => this.parseSchemaObject(`${name}Parent${i + 1}`, x));
+    const subTypes = definition.allOf!;
+
+    const plainObjects = subTypes.filter(
+      x => !isV3ReferenceObject(x) && x.type === "object" && !x.allOf && !x.oneOf
+    ) as OpenAPIV3.SchemaObject[];
+
+    const otherParents = subTypes
+      .filter(x => !plainObjects.includes(x as any))
+      .map((x, i) => this.parseSchemaObject(`${name}Parent${i + 1}`, x));
+
+    const properties = plainObjects.flatMap(x => this.extractObjectProperties(name, x));
+
+    const entity = new InheritedEntity(name, otherParents, properties);
+
+    plainObjects.forEach(object =>
+      object.required?.forEach(property => entity.addPropertyRestriction(property, Restriction.required, true))
+    );
 
-    const entity = new InheritedEntity(name, innerTypes);
     return this.setTypeReference(name, entity);
   }
 
   private parseOneOfObject(name: string, definition: OpenAPIV3.SchemaObject) {
     // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-    const innerTypes = definition.oneOf!.map((x, i) => this.parseSchemaObject(`${name}Option${i + 1}`, x));
+    const subTypes = definition.oneOf!;
+    const innerTypes = subTypes.map((x, i) => this.parseSchemaObject(`${name}Option${i + 1}`, x));
 
     const entity = new UnionEntity(name, innerTypes);
     return this.setTypeReference(name, entity);
   }
 
   private parseObjectWithProperties(name: string, definition: OpenAPIV3.SchemaObject) {
-    const properties = definition.properties
-      ? Object.entries(definition.properties).map(x => this.parseEntityProperty(name, x[0], x[1]))
-      : [];
+    const properties = this.extractObjectProperties(name, definition);
 
     const entity = new ObjectEntity(name, properties);
     definition.required?.forEach(property => entity.addPropertyRestriction(property, Restriction.required, true));
@@ -116,6 +130,12 @@ export default class OpenApi3Parser {
     return this.setTypeReference(name, entity);
   }
 
+  private extractObjectProperties(entityName: string, definition: OpenAPIV3.SchemaObject) {
+    return definition.properties
+      ? Object.entries(definition.properties).map(x => this.parseEntityProperty(entityName, x[0], x[1]))
+      : [];
+  }
+
   private parseEntityProperty(
     entityName: string,
     propertyName: string,
diff --git a/packages/validation/src/automaticEntityValidator.ts b/packages/validation/src/automaticEntityValidator.ts
index 2d4165db..19a48989 100644
--- a/packages/validation/src/automaticEntityValidator.ts
+++ b/packages/validation/src/automaticEntityValidator.ts
@@ -50,6 +50,7 @@ export default class AutomaticEntityValidator<TTarget extends Record<string, any
           continue;
         }
 
+        // TODO just add warning that the target property is not observable
         ensureObservableProperty(target, propertyName, (target as any)[propertyName]);
         this.validatedProperties.push(propertyName);