For an upcoming paid event, we need to register speakers, guests, etc. for free. In attempting to register those people in the admin area, we are unable to use a comp discount code that is for 100% off. Each time we enter the code, it accepts it and changes the total to $0, but upon save we get the error message "Please select at least one option from price set," even though an option was selected prior to submitting.
The discount codes work fine when used on the front-end, but these are courtesy registrations and we want to bypass the confirmation message, since those details have been handled separately.
I was able to work around the issue by creating a new price set for the event that makes use of admin-only options to remove the cost for speakers, however; the issue still remains that the discount codes don't work on the back-end. This has happened on other events in the past, which we by-passed by logging-in as the member and registering via the website front-end. Has anyone else experienced this, and are there troubleshooting steps I can take to find a resolution?
We are running CiviCRM 5.6.0 on Joomla 3.8.13