Document numbers in the Netherlands never contain the letter “O”, but they can contain the number “0”. Even though it seems that there is a letter O in your passport, it will be the number 0. It is also important to know that document numbers in the Netherlands are 9 characters long.
Belgian document numbers may include the letter (s) “O” and / or the number “0”. Belgian document numbers are 8 characters long and always start with 2 letters followed by 6 numbers.