Hello, On master, we are not able to create/copy the same letter (letter code) on different sites (branchcode). Bug 13215 should fix this critical issue. It's not conceivable to have Koha 3.18 released without a fix for this problem. It's still in the 'needs signoff' queue. I can fix quickly any regression or problem you will find testing this patch. Feel free to provide another patch if you like. Cheers, Jonathan http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=13215