[TYPO3-shop] product dissapears in listvieuw after assigning category

[Leen Strijk]

As the subject says

I have the products and categories in the same folder
The listview is pointing to this folder

But whem i assign a category to a product id dissapears out of the list.

I have set pageAsCategory = 2

I need to use the category for use with the related products.