message: added missing method to mixin for adding nav properties
diff: *--------------------------------------------------------------------------------------------*/
  import ECClass from "./Class";
  -import EntityClass, { createNavigationProperty } from "./EntityClass";
  +import EntityClass, { createNavigationProperty, createNavigationPropertySync } from "./EntityClass";
  import { LazyLoadedEntityClass } from "../Interfaces";
  import { ECClassModifier, SchemaItemType, StrengthDirection } from "../ECObjects";
  import { ECObjectsError, ECObjectsStatus } from "../Exception";
  @@ -37,6 +37,10 @@ export default class Mixin extends ECClass {
  return this.addProperty(await createNavigationProperty(this, name, relationship, direction));
  }
  + protected createNavigationPropertySync(name: string, relationship: string | RelationshipClass, direction: string | StrengthDirection): NavigationProperty {
  + return this.addProperty(createNavigationPropertySync(this, name, relationship, direction));
  + }
  +
  public async fromJson(jsonObj: any): Promise<void> {
  await super.fromJson(jsonObj);
  