Addendum: I enabled plack in the other instance. Tested adding an order not filling up barcodes in the items, I was able to save the record and did not get internal server error. However, I got two records of the same order saved. And also, I enabled generate barcodes automatically - generated in the form 1,2,3 and the other one branchcode in the system preference for both, that could be the reason why. When I disabled barcodes not generating automatically in the system preference in the second instance, I did not experienced the error. So, my hunch is if generating barcodes automatically is set, the error will be had if the barcode is already existing. A further delve into the system then why the barcode generated is starting at say INSTI-00002 should be taken into account. Probably the increment settings have to be adjusted. -- View this message in context: http://koha.1045719.n5.nabble.com/Acquisitions-module-internal-server-error-... Sent from the Koha-general mailing list archive at Nabble.com.