In file installer/data/mysql/en/marcflavour/marc21/mandatory/marc21_framework_DEFAULT.yml, there is following entry: > 279 - tagfield: "942" > 280 tagsubfield: "k" > 281 liblibrarian: "Call number prefix" > 282 libopac: "Call number prefix" > 283 repeatable: 0 > 284 mandatory: 0 > 285 kohafield: biblioitems.cn_prefix > 286 tab: 9 > 287 authorised_value: "" > 288 authtypecode: "" > 289 value_builder: "" > 290 isurl: > 291 hidden: 0 > 292 frameworkcode: "" > 293 seealso: "" > 294 link: "" > 295 defaultvalue: However the table does not exist in the DB. I have no clue on who is right.