Advanced conditions for validation
Validation on data have certain rules as well.
Maybe you are only allowed to choose a certain product, which is located in a product table in the data warehouse. In this way, you are sure that the data are consistent with the rest of the data warehouse. If you have many elements in a dropdown box it can be difficult to scroll down to find the right element. In this case, you can choose a "search as you type" option like you know from Google. You just begin by typing the product number or name, and then the options fitting what you type will appear on a list below.
When you make a lookup in another table for validation, it might be necessary to have further validations as your limit of choice might be dependent of another choice in another column. An example could be that you have chosen a country for the specific row and in this country only certain product is sold. In this case you can set up a filter on a value in another configured column.
This means that you can make very specific validation rules in order to get the highest quality in you metadata. The validation rules can be done by business users with no code and is done only once.