@Holger, The specs you referred to indicate that the transaction code has a fixed length of 4. Kees' sample tags adhere to this specification: the space seems to be a filler here. The regexp seems to implement a length of 3 though.
@Holger, The specs you referred to indicate that the transaction code has a fixed length of 4. Kees' sample tags adhere to this specification: the space seems to be a filler here. The regexp seems to implement a length of 3 though.