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Why do I receive a Validation Error when creating a custom lookup field on Activities?

Knowledge Article Number 000206023
Description Add Custom Lookup Fields on Activities (Beta) has been enabled in our organization.  When I try to create a new custom lookup field on Activities, I received the following error:
Validation Errors While Saving Record(s)
There were custom validation error(s) encountered while saving the affected record(s). The first validation error encountered was "Lookups on activities must have a unique domain. You can not have multiple relationships to the same object.". 
Resolution This error will be returned when trying to create a lookup field on Activities to an object that is already connected through an existing lookup field on Activities.  Each custom lookup field can reference one type of record, and no two fields can look up to the same type of record.

Please be aware that the feature to create Custom Lookup Fields on Activities is still in Beta.  It is production quality, but has known limitations. You can provide feedback and suggestions for activity custom lookup fields on the IdeaExchange.

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