Hello! Field 105 UNIMARK contains encoded data. It is now a simple text box. Please, add "Tag editor" as in field 100. https://www.ifla.org/files/assets/uca/unimarc_updates/BIBLIOGRAPHIC/u-b_105_update.pdf
Hi Igor, please check the unimarc_field_100.pl value builder is linked to 100 in your frameworks.