1:1 Relations Without a Key Field Definition

If the key fields for the relation are not relevant - if, for example, you are dealing with a trivial, single 1:1 relation between the two connected tables - you can declare the fields as follows:

<parent table>:<linked table>.<field name>, e.g.

OrderDetails:Orders.OrderDate

This adds a folder with the field OrderDate to the list of variables below the OrderDetails hierarchy:

Of course, you must make sure that when printing the OrderDetails table, you fill this field with the corresponding value for each record.