Work Items and direct links
Queries of type "Work items and direct links" are helpful when you want to understand relationships between your Work Items.
It is crucial to understand that instead of Work Items, these queries import links.
This requires special structure of the table to encounter for both sides of the link.
Table created in Power BI consists of Link Type column and two sets of columns for source and target all prefixed with "Source " and "Target " respectively.
