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That is right. The validation number is commonly called the "check digit" and this digit is usually added to the end or beginning of the number. The most common method used to add a "check digit" is the MOD 10 method.Altair said:There are many organizations that will not issue consecutive numbers so people cannot just add 1 to their own number, eg. banks their customer numbers and bank account numbers are produced using an algorithm where all the numbers will result in a validation number
JohnK said:That is right. The validation number is commonly called the "check digit" and this digit is usually added to the end or beginning of the number. The most common method used to add a "check digit" is the MOD 10 method.