Diagnosis
When the paying office number is entered, a check is performed. Thischeck indicated that the number is incorrect.
The following check must be made:

• The first three digits must be 106 to 108.


• The last digit of the paying office number is the check digit. The
calculated check digit and the last digit of the sum of the calculatedcheck digit and the constant 5 are permitted.
The check digit is calculated as follows:

• The digits of the paying office number (digits 1 to 7) are multiplied -
starting with the first digit - by the factors 1, 2, 1, 2, 1, 2, 1.

• The checksums are formed for each of the products.


• The checksums are added up.


• The total is divided by 10.


• The remainder is the check digit.