N41 validates user’s input.

When you enter alphabets in a field which should be number, it will display “Item ‘THE TEXT YOU INPUT’ does not pass the validation test”

When you clear the field blank instead of 0, it will display “Item ‘’ does not pass the validation test”

When you get this message, click OK button and right click anywhere in the screen.

It will input 0 for you.

Click “OK” [1]

Right click anywhere in the screen [2]