I run into a strange problem and suspect this to be a bug in Koha. We are using Koha 24.11.02. Wenn exporting all records with export_records.pl the field 773$w shows up in the export whichever record has it set. When I get the latest changes by OAI/PMH e.g. 'verb=ListRecords&from=2025-06-16T04:00:00Z&until=2025-06-16T10:00:00Z&metadataPrefix=marcxml' most of the records are missing 773$w, though it should be set. Other subfields of 773 (773$t and 773$x) are exported. Just 773$w is missing. Though, a few records (1 out of 10) has 773$w set. Is there any explaination for it? I compared the two marcxml for a single record in Koha, the one exported by export_records.pl and the one delivered by an OAI/PMH update. They are almost identical except for the missing 773$w and some minor xml formating Let me know if you need more information, e.g. an example of a record.