Cascading delete
The Dataverse relationship setting that controls what happens to child records when their parent is deleted — cascade, restrict, or remove link.
Cascading delete in Dataverse is the relationship-level setting that controls what happens to child records when their parent is deleted. The options: Cascade (child records deleted too — useful when children have no meaning without parent, e.g. Sales Order Line on Sales Order), Restrict (block the parent's deletion if children exist — safer when children have independent value), Remove Link (delete parent but break the relationship to children, leaving them orphaned — rarely the right choice), Cascade Active (cascade only to active children), or Cascade User-Owned (cascade only to children owned by the same user). Configure cascade behaviour at relationship design time; reversing surprising data loss is rarely possible.