https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=32950 --- Comment #11 from Jonathan Druart <jonathan.druart@gmail.com> --- Created attachment 187451 --> https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=187451&action=edit Bug 32950: Fix moving subfield losing values for repeatable fields Moving one subfield to another was failing for repeatable fields where the field to be moved doesn't exist in the first instance. When moving subfields within the same field type (e.g. 020$z to 020$a), existing subfield values in fields that didn't contain the source subfield were being overwritten with values from other fields. This patch fixes the issue by determining which fields actually contain the source subfield and only updating those corresponding target fields, preserving existing values in fields that don't have the source subfield. The fix adds logic to _copy_move_subfield to: 1. Use field_exists() to identify which fields have the source subfield 2. Pass these field numbers to _update_subfield for targeted updates 3. Preserve all existing functionality while fixing the data loss bug Test plan: 1. Create a MARC modification template to move 020$z to 020$a 2. Create a record with multiple 020 fields: - Some with existing $a values - Some with $z values to be moved 3. Apply the template 4. Verify existing $a values are preserved 5. Verify $z values are moved to $a only in appropriate fields 6. Verify $z subfields are removed after the move Signed-off-by: Bernard Scaife <bernard.scaife@openfifth.co.uk> -- You are receiving this mail because: You are watching all bug changes.