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I just tried this on the Drupal sandbox:
- Create a custom field set for Participant (general, not for a specific event or specific type)
- Add a custom field: 'Wants to carpool'. Choose 'yes or no' as type, and make it required.
- Now try to register someone for an event.
The custom field is not shown, but you get an error message because the required field 'Wants to carpool' is not filled out.
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More exact: changing the 'used for' cannot be changed using the ui once it is used for a participant.
here's a proposed fix for this:
https://github.com/civicrm/civicrm-core/pull/8033
I'm not crazy about the fix, as it's basically just fixing something that is broken upstream. it seems like this particular null string fix is already happening in preprocess, but for some reason, it's not getting hit there.
Submitted a PR https://github.com/civicrm/civicrm-core/pull/8050 fixing it in the upstream from where it is initiated
Tested above PR. Works fine.
Tested the PR. Works fine.
As a workaround, you can change the custom field set so that it is used for 'Participant (role)', and select 'any role' from the role-drop-down.
Changing the 'used for' to 'participant (role)' cannot be undone, as it seems.