Do not delete the default 'Calculate' in the 'Calculations' tab in Cube

The default 'Calculate' under the  'Calculations' tab in Cube is important to keep. Today, I define a named calculation. Then I delete the 'empty' default Calculate statement. After deployment, when I browse the cube and find no numbers for any measures. Then I use the form view, add 'Calculate' back. After deployment and re-connection, the numbers show up.