def update_cnum(self):
if "<STR_LIT>" not in self.collections:<EOL><INDENT>cnums = record_get_field_values(self.record, '<STR_LIT>', code="<STR_LIT:w>")<EOL>for cnum in cnums:<EOL><INDENT>cnum_subs = [<EOL>("<STR_LIT>", "<STR_LIT>"),<EOL>("<STR_LIT:a>", cnum)<EOL>]<EOL>record_add_field(self.record, "<STR_LIT>", subfields=cnum_subs)<EOL><DEDENT><DEDENT>
Check if we shall add cnum in 035.