When creating a recurring event series with a record that includes a custom field with a unique attribute, you may encounter the following error:
Error:- duplicate value found: customfield__c duplicates value on record with id: 00U**********
Note- This is expected behavior when using a unique field.
This is expected behavior when checking the "Unique. Do not allow duplicate values" option when creating a custom field. Duplicate values will be prevented in this field across all Event records in a recurring event series. There are no workarounds to this behavior when a unique field is involved in a recurring event.
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