Dynamics 365 FO Extension for Form Datasource field and to get the current record

 [ExtensionOf(formdatafieldstr(EntAssetRequestTableCreate, RequestTable, Object))]

final class TRGEntAssetRequestTableCreateFDF_RT_Object_Extension

{  

    public void modified()

    {

        FormDataObject dataObject = any2Object(this) as FormDataObject;

        next modified();        

        FormDataSource fds = dataObject.dataSource().formRun().dataSource(formDataSourceStr(EntAssetRequestTableCreate, TRGEntAssetRequestObjectTableView));

        fds.executeQuery();

    }