Invoice identification features

Hi,

I wonder why there is not a single primary identification feature printed on the bank transfer text. No customer number, no invoice number, no order number, no nothing. But there is the ULR (even twice), EREF (?), MREF (?), CRED (?), IBAN, BIC ... 

Why couldn't you print at least the invoice number? That would be nice.

Regards,

Stefan