Error 9379: Box 765 can only be completed if Box 30 is on or before 31 March 2020 in Corporation Tax

Scenario

You may see the following error message when you file CT600.
Error message
Error 9379: Box 765 of Form CT600 can only be completed if the date in Box 30 is on or before 31 March 2020.

Cause

A zero is shown in box 765 when this box should be empty.

Solution

  1. Select
    Forms
    ,
    CT600
    , then
    Enable Editing
    .
  2. Select
    0
    in Box 765, then press
    Spacebar
    .