The following expression should do it IF(LEN({DE:Global | Global marketing campaign id}) != 9,"Please write '2 Alpha' '7 digit' and 'in total it should be 9' without spaces (eg-tmtpredict)", IF(CONTAINS(0, LEFT({DE:Global | Global marketing campaign id}, 2)), "Please start with '2 Alpha' without spa...

Thanks for trying.To make sure I understand your case correctly, your original problem was that you wanted the field value to have 9 characters, right? The formula you have right now is saying if the field's length is 9 characters, show the error message. Hence, if you type anything expect 9 length ...

Thanks for reaching out. Could you please retry with double equation signs?IF(LEN({DE:Global | Global marketing campaign id}) == 9,"Please write '2 Alpha' '7 digit' and 'in total it should be 9' without spaces (eg-tmtpredict)")

I can see the question has an accepted answer, but I am happy to let you know that with the release of 25.10 you can achieve this via Custom Field Validations. You can even show the number of characters that are over the limit in the error message. A good example of it can be found under this discus...