+=item C<action_add_from_record>
+
+When adding new items to records they can be created on the fly if the entered
+partnumber or description doesn't exist yet. After being asked what part type
+the new item should have the user is redirected to the correct edit page.
+
+Depending on whether the item was added from a sales or a purchase record, only
+the relevant part classifications should be selectable for new item, so this
+parameter is passed on via a hidden parts_classification_type in the new_item
+template.
+