Developer forum

My previous attempt to create an item type is solved, but I still don't know why. Now I'm creating an item type Gallery, which consists of a list of Item type Image. I've created the Images field in Gallery, but cannot find anywhere to tell DW that the Images field is a list of Images. The Image list is a field of fieldltype item-relation-list. In my Vendor (last item type I created) it just worked. Now it doesn't and I don't understand why.