1. A computer-implemented method for executing a service in a computer-based business management system, comprising: responsive to a first request to generate a first user interface element in a first user interface screen from a model-driven user interface, sending the first request to a core node that includes data to be displayed in the first user interface element and a formatting parameter identifying a presentation format of the displayed data; generating the first user interface element according to the data and formatting parameters present in the core node; displaying the first user interface element in the first user interface screen; responsive to a second request to generate a second user interface element in a second user interface screen linked to the first user interface screen, sending the second request to a node corresponding to the second user interface element, the node being a transformation node that identifies data from another node to be displayed in the second user interface element and a formatting parameter identifying a presentation format of the displayed data; retrieving data from the core node according to an identifier present in the transformation node; generating the second user interface element according to data retrieved from the identified core node and formatting parameters retrieved from the transformation node; and displaying the second user interface element in the second user interface screen; wherein data of the transformation node data is stored without persistency within the data object except for its identified core node.