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How do I add a Custom Object to the Related To Lookup for an Event or Task?

Knowledge Article Number 000004351
Description I am not able to relate Tasks or Events to my custom object. How do I enable this?
Resolution In order for a Custom Object to show in the "Related To" Lookup list for an Event or Task, the "Allow Activities" (Track Activities) check-box must be checked in the Custom Object Definition. To do this:

   1. Go to Setup | Create | Objects.
   2. Click Edit to modify an existing custom object.
   3. Check the "Allow Activities" check-box under Optional Features.


You will get the following screen to confirm before this is final:

User-added image

This means that all page layouts created for the custom object will need to be edited and have the related list added. (Also see - Customizing Related Lists)

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