New attribute for existing product-type is not working in excel export and import.

Hey experts,

i have created a new attribute for an existing product type. (Product/Product/Core) I did it in the backoffice type area under the properties attribute tab.

The new attribute is already created and shown in the product-view. When i fill the new attribute and generate an excel-export, the new attribute is shown without any existing value.

What can i do to show the new attribute value?

Best Michael.