To reproduce: 1) Set library to a branch 2) Search for a record, edit the item, then save the item ( note the lack of url parameters now ). 3) From the item editor, select "Set library" by clicking the library name in the upper right corner 4) Select a new library, click submit 5) Note the error This is a fundamental issue with the way selectbranchprinter.pl redirects to the previous page. If the page that selectbranchprinter.pl is redirecting to was submitted via POST parameters, errors such is this one may occur. If it was via GET, everything will work just fine.
Created attachment 24235 [details] [review] Bug 11532 - Possible start for a fix
Hope it's good news, but I was not able to replicate the issue. I followed the test plan and ended up on the item form again without any errors.