ERROR PROCESSING TEMPLATE: undef error - Exception 'Koha::Exceptions::Account::IsNotCredit' thrown 'Account line 321 is not a credit' at /kohadevbox/koha/pos/printreceipt.pl line 54. at /usr/lib/x86_64-linux-gnu/perl-base/Carp.pm line 289 1. Make a purchase through Point of Sale. 2. Go to the transaction history for the register you used. 3. Issue a refund for the purchase. 4. Click the "Print receipt" button for that refund.