The OrderId field for the Gantt tasks cannot be defined in its datasource using the UI for ASP.NET Core wrappers.
*for more details, please refer to ticket #1461758
Create a UI for ASP.NET Core project and try to initialize the Gantt component with a datasource configured similar to the following:
The marked "OrderID" definition is not a valid one in UI for ASP.NET Core
The datasource configuration provided above(or similar) should be valid for the Gantt component. The OrderID should be configurable using the ASP.NET Core wrappers.