Numeric constant added for creation of parallel invoice number on customer invoices

A new reference object '&FXNUM' is added in 'Additional Payment Reference. Open' (CMS090) that you can use to create parallel invoice numbers on customer invoices. You can also use this reference object for check digit calculation.

If you have to calculate a check digit and the invoice number (CINO) is used as an object in the reference number, then you cannot use an invoice prefix that contains letters.

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