Refresh Data Source View Dialog Box
Use the Refresh Data Source View dialog box in SQL Server Data Tools (SSDT) to accept or cancel the changes that will occur as a result of refreshing the data source view. The dialog box shows the changes that will be made to the data source view as a result of changes made to the underlying data source. Click OK to accept the changes and refresh the data source view, or Cancel to ignore the changes and leave the data source view unchanged. You can display the Refresh Data Source View dialog box by:
Clicking Refresh Data Source View on the Toolbar pane of Data Source View Designer.
Right-clicking the Diagram pane of Data Source View Designer and selecting Refresh.