The field B_streetnumber is present at sql level in table borrowers but it is not used in Koha. You can't insert data into it using members/memberentry.pl It does not display in 'Alternate address' section of members/moremember.pl It isn't present in opac (opac-memberentry.pl). You can only import it with tools/import_borrowers.pl I think we need a way to insert/display it
*** This bug has been marked as a duplicate of bug 10760 ***