Allow editing of product version with the right permission.

bookie/src/app/core/product.ts

@@ -5,6 +5,7 @@ import { Tax } from './tax';
 
 export class Product {
   id: string | undefined;
+  versionId?: string;
   code: number;
   name: string;
   units: string;
@@ -20,6 +21,9 @@ export class Product {
   enabled: boolean;
   tax: Tax;
 
+  validFrom?: string;
+  validTill?: string;
+
   public constructor(init?: Partial<Product>) {
     this.id = undefined;
     this.code = 0;