The user number is read for each bank by the
program that creates the data medium and copied onto the data medium. It is
used in Norway, Great Britain, and Ireland.
Incorrect field contents lead to processing errors
and can cause the program to terminate (this is especially the case for
program RFFOGB_T).
Detailed notes on how to use the field for data medium exchange in Great Britain and Ireland can be found in the documentation for the payment medium program RFFOGB_T.
Detailed notes on how to use the field for data medium exchange in Norway can be found in the documentation for the payment medium programs RFFONO_D and RFFONO_T.