There are cases[*] when one might want to have LOWERCASE letters in a spine label. These include 'a','b','c','d',... and 'z' after the date. Although in the items table, itemcallnumber already allows (and in our system already has) lowercase letters in such cases, when printing the spine label PDF, all these are converted to UPPERCASE. I believe that call numbers should not be converted to uppercase prior to PDF export. [*] For example: PS 3603 .L548 R43 2011a <--- meaning the item is a Photocopy PS 3603 .L548 R43 2011b <--- meaning the second edition or PS 3603 .L548 R43 2011z <--- meaning the year is uncertain (You may find more such cases here: https://sites.smu.edu/cul/cip/docs/CAT/cpm-050-090.htm)
This issue was addressed in bug 10821 and has since been fixed in Library::Callnumber::LC (https://github.com/libraryhackers/library-callnumber-lc/commit/1b42bed2a42ce73679739edce6586339b192dc5b) Two things to consider here: 1. Are you using the latest release of Library::Callnumber::LC? 2. Are you using a localized variation of the LCCN system? (http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=10821#c32)
Chris you are right! We had Library-CallNumber-LC v0.22 installed. We upgraded to 0.23 and the problem was solved! Having said that, with the new version, new problems with callnumber splitting were found, but they are not related to this case. Thanks again for such a prompt reply! I will close this case right away.