Error exporting to excel

[Werther]

Found the solution with this post:

Expanding Entities and Export

Hi, I have three tables: Purchase, Product & ProductType Every Purchase has a Product (telling me which product was purchased) and each Product has a ProductType (telling me of which type the product is). I have a grid showing the purchases of a customer and in the columns I show the product name and product type name. By using $expand I can easily include the Product and ProductType entities. Now I also want to use the Export function (to CSV and Excel). The problem is that the selected co…