The fields in import_biblios are much shorter and stricter than those in the biblios. The can cause odd behaviour where records import successfully but don't appear correctly in the import results To recreate: (assuming you are using sample date) 1 - Tools->export data 2 - Select nothing and click "Export bibliographic records" 3 - Save the file 4 - Tools->Stage MARC for import 5 - Stage the file - turn off matching and item processing 6 - Manage the batch 7 - Click Show -> All in the datatable 8 - Browse through and note some records show 'null' for title 9 - Import the batch 10 - Note the null titles don't show a biblionumber 11 - Search for one of them e.g. "Forest management div" 12 - It returns in results and is a valid Koha record, not the biblionumber 13 - Check the db: SELECT * FROM import_biblios WHERE matched_biblionumber=XXXX 14 - No import_biblio entry Error during import: [Wed Sep 23 17:53:20.821380 2020] [cgi:error] [pid 134046] [client 172.18.0.1:57228] AH01215: [Wed Sep 23 17:53:20 2020] stage-marc-import.pl: DBD::mysql::st execute failed: Data too long for column 'title' at row 1 [for Statement "INSERT INTO import_biblios (import_record_id, title, author, isbn, issn) VALUES (?, ?, ?, ?, ?)" with ParamValues: 0='474', 1="Pictura mural\xc4\x83 din nordul Moldovei: modificari estetice si restarare = Mural painting in the north of Moldavia: aesthetic modification and restoration.", 2="Dina, Anca (ed.).", 3="973177212X", 4=undef] at /kohadevbox/koha/C4/ImportBatch.pm line 1640.: /kohadevbox/koha/tools/stage-marc-import.pl, referer: http://localhost:8081/cgi-bin/koha/tools/stage-marc-import.pl MariaDB [koha_kohadev]> describe import_biblios; +----------------------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------------------+--------------+------+-----+---------+-------+ | import_record_id | int(11) | NO | MUL | NULL | | | matched_biblionumber | int(11) | YES | MUL | NULL | | | control_number | varchar(25) | YES | | NULL | | | original_source | varchar(25) | YES | | NULL | | | title | varchar(128) | YES | MUL | NULL | | | author | varchar(80) | YES | | NULL | | | isbn | varchar(30) | YES | MUL | NULL | | | issn | varchar(9) | YES | | NULL | | | has_items | tinyint(1) | NO | | 0 | | +----------------------+--------------+------+-----+---------+-------+ MariaDB [koha_kohadev]> describe biblio; +---------------+-------------+------+-----+-------------------+-----------------------------+ | Field | Type | Null | Key | Default | Extra | +---------------+-------------+------+-----+-------------------+-----------------------------+ | biblionumber | int(11) | NO | PRI | NULL | auto_increment | | frameworkcode | varchar(4) | NO | | | | | author | longtext | YES | | NULL | | | title | longtext | YES | | NULL | | | medium | longtext | YES | | NULL | | | subtitle | longtext | YES | | NULL | | | part_number | longtext | YES | | NULL | | | part_name | longtext | YES | | NULL | | | unititle | longtext | YES | | NULL | | | notes | longtext | YES | | NULL | | | serial | tinyint(1) | YES | | NULL | | | seriestitle | longtext | YES | | NULL | | | copyrightdate | smallint(6) | YES | | NULL | | | timestamp | timestamp | NO | | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP | | datecreated | date | NO | | NULL | | | abstract | longtext | YES | | NULL | | +---------------+-------------+------+-----+-------------------+-----------------------------+ 16 rows in set (0.00 sec) MariaDB [koha_kohadev]> describe biblioitems; +-----------------------+--------------+------+-----+-------------------+-----------------------------+ | Field | Type | Null | Key | Default | Extra | +-----------------------+--------------+------+-----+-------------------+-----------------------------+ | biblioitemnumber | int(11) | NO | PRI | NULL | auto_increment | | biblionumber | int(11) | NO | MUL | 0 | | | volume | longtext | YES | | NULL | | | number | longtext | YES | | NULL | | | itemtype | varchar(10) | YES | MUL | NULL | | | isbn | longtext | YES | MUL | NULL | | | issn | longtext | YES | MUL | NULL | | | ean | longtext | YES | MUL | NULL | | | publicationyear | mediumtext | YES | | NULL | | | publishercode | varchar(255) | YES | MUL | NULL | | | volumedate | date | YES | | NULL | | | volumedesc | mediumtext | YES | | NULL | | | collectiontitle | longtext | YES | | NULL | | | collectionissn | mediumtext | YES | | NULL | | | collectionvolume | longtext | YES | | NULL | | | editionstatement | mediumtext | YES | | NULL | | | editionresponsibility | mediumtext | YES | | NULL | | | timestamp | timestamp | NO | MUL | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP | | illus | varchar(255) | YES | | NULL | | | pages | varchar(255) | YES | | NULL | | | notes | longtext | YES | | NULL | | | size | varchar(255) | YES | | NULL | | | place | varchar(255) | YES | | NULL | | | lccn | varchar(25) | YES | | NULL | | | url | mediumtext | YES | | NULL | | | cn_source | varchar(10) | YES | | NULL | | | cn_class | varchar(30) | YES | | NULL | | | cn_item | varchar(10) | YES | | NULL | | | cn_suffix | varchar(10) | YES | | NULL | | | cn_sort | varchar(255) | YES | | NULL | | | agerestriction | varchar(255) | YES | | NULL | | | totalissues | int(10) | YES | | NULL | | +-----------------------+--------------+------+-----+-------------------+-----------------------------+ 32 rows in set (0.01 sec)