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OldDeadBug The Apex Developer Guide says the setWhatID method requires an id, and'The value must be one of the following types:"
It then lists standard Objects as well as Custom.
Is the expected value the 3 character prefix? the prefix with 12 '0's
behind it, or the Record ID, or what?
No you have to specify a concrete SF Id of a record of type (see list in Developers guide).
It means that the specified Id must be of type Account, Asset, or any custom object. It can't for example reference a record id of a contact because contact is not in the list and is not a custom object.
Id accountId = [Select a.Id from Account a where Name = 'xx' limit 1].Id; x.setWhatId(accountId);