Is CaseComment an Object? If yes, why can’t I make a custom lookup referencing it? If no, what it is?

Adding to title: Lookup relationships to CaseComment can not be created; there is no CaseComment entry in the picklist of related objects when defining a custom lookup field.

Answer

It is an SObject, and you can query it normally, but it’s a special type of standard (built-in) object that has a number of unique attributes.

Case comments:

  • Can’t have custom fields added.
  • Don’t support workflow rules.
  • Don’t support validation rules.
  • Cannot be part of a custom lookup or master-detail relationship.
  • Case comments don’t count against your org’s storage use.
  • Private case comments don’t participate in standard sharing, and can have more restrictive visibility than the parent case (not possible in custom master-detail relationships).

Attribution
Source : Link , Question Author : Ganesh Bhosle , Answer Author : ca_peterson

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