[Koha] Report error (SQL )

Hello everybody. We have an sql senteces to extract SUBTITLE (ExtractValue(biblioitems.marcxml, '//datafield[@tag="245"]/subfield[@code="b"]') AS "Subtitulo) but now it say this field is obsolete. Where is the subttile? Thanks -- *Luis Moisés Rojas P.* <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Libre de virus. www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>