Sample URL: https://demo.flexibee.eu/c/demo/faktura-vydana.xml?relations=vazby&includes=/faktura-vydana/vazby/vazba/b/&detail=custom:vazby(b(jakUhrK))Related ArticlesHow to retrieve an issued invoice including invoice line items and price list data via APIHow to Get Started with Flexi API (3/6)Advanced API Call ExamplesGetting Document Line ItemsUser Relationships - API