Paying with a bank transfer (SEPA CT) contains the risk of not correctly submitting the (invoice) data in the transaction. The correct provision of the data is necessary in order to be able to report the transaction as paid. This reconciliation of the SEPA CT can be supported by using the mechanism that is referred to within the NL banking environment as the Payment Reference.
Within the NL bank environments, the entered Payment Reference is checked by means of the MOD11 test. By applying this MOD11 calculation to the invoice number, incorrectly entered invoice numbers are already rejected in the banking environment. In that case, the debtor will first have to check and correct the invoice number before this transfer can be completed in the banking environment.
In the transfer request, the Merchant can be asked to enter the invoice number in the Payment reference field within the bank environment in the e-mail, letter or SMS. This reduces typos.
Building up the invoice number in accordance with the MOD11 calculation can be done by calculating a check number. See the figure below for visual guidance. The steps are as follows:
* Note : The weighting numbers for the calculation within the MOD11 have a fixed series. They are defined from right to left as follows: 2, 4, 8, 5, 10, 9, 7, 3, 6, 1, 2, 4, 8, 5, 10.