Defines name/code correspondences for production items.
items_prodA tibble where each row corresponds to one production item. It contains the following columns:
item_prod_code: A numeric code used to refer to the item.
item_prod_name: A natural language name for the item.
item_type: An ad-hoc grouping of items. This is a work in progress
evolving depending on our needs, so for now it only has two possible
values:
crop_product: The CBS item represents a crop product.
other: Not any of the previous groups.